We strongly recommend having your ring size professionally measured for the most accurate fit. Ring sizing is a personal preference. Rings should have some resistance going over the knuckle and feel snug but comfortable at the base of your finger.
Size will fluctuate with factors such as climate and hydration. Measure your finger at different times to get an average. Band thickness also impacts fit. Wider bands and stacked rings will likely require sizing up. Ring Size Resources
Inner Diameter (mm)
AU, NZ, UK
US, CA
13.94 mm
F
3
14.14 mm
F 1/2
3 1/4
14.34 mm
G
3 1/2
14.54 mm
G 1/2
3 3/4
14.74 mm
H
4
14.94 mm
H 1/2
4 1/4
15.14 mm
I
4 1/2
15.34 mm
I 1/2
4 3/4
15.54 mm
J
5
15.74 mm
J 1/2
5 1/4
15.94 mm
K
5 1/2
16.14 mm
K 1/2
5 3/4
16.32 mm
L
6
16.52 mm
L 1/2
6 1/4
16.72 mm
M
6 1/2
16.92 mm
M 1/2
6 3/4
17.12 mm
N
7
17.32 mm
N 1/2
7 1/4
17.52 mm
O
7 1/2
17.72 mm
O 1/2
7 3/4
17.92 mm
P
8
18.12 mm
P 1/2
8 1/4
18.32 mm
Q
8 1/2
18.52 mm
Q 1/2
8 3/4
18.72 mm
R
9
18.92 mm
R 1/2
9 1/4
19.12 mm
S
9 1/2
19.32 mm
S 1/2
9 3/4
19.52 mm
T
10
19.72 mm
T 1/2
10 1/4
19.92 mm
U
10 1/2
20.1 mm
U 1/2
10 3/4
20.3 mm
V
11
20.5 mm
V 1/2
11 1/4
20.7 mm
W
11 1/2
20.9 mm
W 1/2
11 3/4
21.1 mm
X
12
21.3 mm
X 1/2
12 1/4
21.5 mm
Y
12 1/2
21.7 mm
Z
12 3/4
Made to Order
Marquise Cosmic Trio
Order today & receive by the
7th of October 2025
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Product details
The Cosmic Trio features a marquise diamond centre stone accented by two round side stones for a radiance that will last a lifetime.
This design is made to order and can be crafted in 18K yellow gold, white gold, rose gold and platinum.
Metal18K Yellow Gold
18K Yellow Gold is a luxurious alloy with 75% pure gold, featuring a lustrous, rich yellow colour. The most pure gold alloy, it provides excellent longevity, ideal for lifetime pieces.
Metal18K Rose Gold
18K Rose Gold is a durable, luxurious alloy with 75% pure gold, and a rich, lustrous rose-pink colour. The most pure gold alloy, it offers the best longevity for lifetime pieces.
Metal18K White Gold
18K White Gold is a luxurious alloy with 75% pure gold, naturally dark grey and rhodium plated for a bright white finish. Its purity and durability are ideal for lifetime pieces.
MetalPlatinum
Platinum is a dense, durable, naturally white metal that develops a patina over time. It's highly resistant to bending and can be polished to restore its shine.
Metal18K Yellow Gold | Two Tone
An optional design feature where the setting and claws are crafted in Platinum, and the
shank in 18K Yellow Gold.
Metal18K Rose Gold | Two Tone
An optional design feature where the setting and claws are crafted in Platinum, and the
shank in 18K Rose Gold.
SettingCosmic Trio
A three-stone design, featuring your choice of centre stone shape accented by round diamond accents. Crafted in a high-profile open silhouette.
Band ProfileHalf Round
Our most requested band profile, gently rounded from the top with flat sides and inner edge. Giving the illusion of a daintier band, this profile is perfect for seamless stacking.
SettingCosmic Trio
A three-stone design, featuring your choice of centre stone shape accented by round diamond accents. Crafted in a high-profile open silhouette.
Band ProfileHalf Round
Our most requested band profile, gently rounded from the top with flat sides and inner edge. Giving the illusion of a daintier band, this profile is perfect for seamless stacking.
SettingCosmic Trio
A three-stone design, featuring your choice of centre stone shape accented by round diamond accents. Crafted in a high-profile open silhouette.
Band ProfileHalf Round
Our most requested band profile, gently rounded from the top with flat sides and inner edge. Giving the illusion of a daintier band, this profile is perfect for seamless stacking.
SettingCosmic Trio
A three-stone design, featuring your choice of centre stone shape accented by round diamond accents. Crafted in a high-profile open silhouette.
Band ProfileHalf Round
Our most requested band profile, gently rounded from the top with flat sides and inner edge. Giving the illusion of a daintier band, this profile is perfect for seamless stacking.
SettingCosmic Trio
A three-stone design, featuring your choice of centre stone shape accented by round diamond accents. Crafted in a high-profile open silhouette.
Band ProfileHalf Round
Our most requested band profile, gently rounded from the top with flat sides and inner edge. Giving the illusion of a daintier band, this profile is perfect for seamless stacking.
SettingCosmic Trio
A three-stone design, featuring your choice of centre stone shape accented by round diamond accents. Crafted in a high-profile open silhouette.
Band ProfileHalf Round
Our most requested band profile, gently rounded from the top with flat sides and inner edge. Giving the illusion of a daintier band, this profile is perfect for seamless stacking.
Behind The Ring
Our Guarantee To You
Responsibly Crafted in Australia
Complimentary Service & Cleans
7 - 10 Weeks Production
This engagement ring is crafted to order and has a 7 - 10 weeks production timeframe. This manufacturing process does not include shipping timeframes and is subject to change, especially during peak wedding and holiday seasons.
As a recommendation, we advise allowing plenty of time before your proposal or event to order your rings, to ensure a smooth, stress-free production and delivery experience.
Development
Our designers create technical drawings for your unique ring, shared with you for approval
Crafting
Your ring is meticulously crafted in Australia through our extensive production process
Completion
Receive a gallery of imagery of your beautiful ring before it is ready for collection or shipping
Despite being crafted from durable materials, rings require proper care for longevity. Always remove rings before tasks like cleaning, gardening, exercising and while sleeping to avoid pressure or damage. Do not wear rings at the gym or during manual handling. Keep rings away from chemicals such as lotions, skincare and chlorine.
Diamonds
Diamonds are the hardest natural material, but are not indestructible. They can still chip or break if struck with force, particularly on edges or points. Protect your diamonds from knocks by being mindful of how you wear your rings or other pieces. Store jewellery individually in its original packaging to avoid contact and scratching with other diamonds.
Gemstones
Gemstones, including sapphires, are durable but still require care. Avoid exposure to harsh chemicals, lotions, and cleaning products, which can dull their surface. Clean only with a soft cloth, or gentle soap and water. Most gemstones are unsuitable for an ultrasonic cleaner.
Service & Clean
A professional service and clean begins with a thorough check of the item's shape and condition, looking for any damage. After using an ultrasonic cleaner to remove debris, we inspect the stones and settings under stereo microscopes to ensure they’re secure and identify any wear, scratches, or dents. Necessary adjustments are made, such as straightening, polishing, or re-tightening settings. For white gold and platinum, rhodium plating is applied to restore brightness.
Annual servicing, especially for rings and tennis bracelets, helps maintain your jewellery's beauty and longevity.
We ship worldwide! Online orders are processed Monday to Friday, excluding public holidays. All parcels require a signature upon delivery and include tracking and insurance whilst in transit.
Returns & Exchanges
LOUISE JEAN does not issue refunds, store credit, or exchanges for any made-to-order engagement rings or wedding bands.
We kindly ask that you choose carefully – we will be happy to assist with any questions you have about our pieces prior to placing your order. Customer satisfaction is very important to us. If you aren’t happy with your item, please contact us and we will work together to resolve the issue.
In jewellery, stone shape refers to the physical form or outline of the diamond or gemstone, which impacts its overall appearance and style. Often confused with cut, common shapes include oval, round, emerald, cushion, and more. Each shape highlights different aspects of the gemstone's hue, brilliance and fire. When selecting a gemstone, consider personal style and how the stone's shape will complement the setting and overall design of the piece.
Diamond Size
Carat (ct) is the unit of weight used to measure diamonds and gemstones, and is primarily what influences their value. One carat equals 0.2 grams. Larger carat weights typically indicate larger stones, however, the size can depend on the stone’s shape, cut, and the relative density of the gemstone.
Carat Total Weight (cttw) refers to the combined weight of all diamonds or gemstones in a piece of jewellery. For multi-stone designs, this figure gives the total weight of all stones, not the weight of any individual one.
Diamond Colour
Colour in a diamond is a natural phenomenon caused by trace elements during its growth. The D to Z scale is the industry’s most widely used grading system, evaluating diamonds based on their colour.
Subtle colour differences can impact a diamond’s value, even between stones of the same carat and clarity, though distinctions are often unnoticed by the untrained eye between D and G.
Colour Scale
Band Width
Band width refers to the width of the ring’s shank, which is different from its height. Most LOUISE JEAN engagement rings have widths ranging from 1.6mm to 2.5mm
While custom widths are available, there are minimum width requirements to ensure structural durability, based on factors like design, ring size, and stone size.
Our team is happy to assist with any inquiries about band widths and can help ensure visual balance and proportionality for your design.
Our classic, unisex wedding band designs are available in 3mm, 4mm, 5mm, 6mm, and 7mm widths. This applies to our Classic Ring, Cuff Ring, and Knife Edge Ring.
Typically, 3-5mm is most common for female rings, while 4-6mm is most common for male rings.
Keep in mind that the wider the band, the tighter it will feel on your finger. As the width increases, you may need to increase the ring size for a more comfortable fit.
Diamond Clarity
During the diamond growth process, internal impurities called inclusions are formed. Clarity grading evaluates their type, position, and visibility, ranging from Flawless (F) to I3.
Aiming to select diamonds that are eye-clean, with inclusions too tiny to be seen without magnification, provides the best balance of value and quality.
Clarity doesn't affect brilliance or sparkle, and as long as a diamond is eye-clean, clarity gradings are indistinguishable to the naked eye.
Diamond Cut
The cut of a diamond refers to the facet arrangement, which impacts its light performance, fire, brilliance, and overall beauty. Cut is one of the most important yet misunderstood aspects of a diamond. Cut is graded by measuring angles and facet sizes. Inferior cuts can cause light leakage or dark zones, resulting in a dull diamond or severe bowtie.
Only round diamonds have a specific cut grading on their certificate, as they follow standardised guidelines for proportions. All other diamonds, known as fancy shapes, do not have a universal cut grading but may have their polish or symmetry assessed. Cut grading can only truly be assessed by inspecting the diamond itself, not the certification.
Diamond Dimensions
All diamonds, regardless of shape or carat, have unique dimensions. This refers to the length, width, and depth of each stone, measured in millimeters. Two diamonds of the same shape and carat weight can look very different to the eye due to variations in their proportions. Dimensions affect not only the diamond's size and visual appearance, but can impact their cut quality and sparkle.
CTTW
CTTW (Carat Total Weight) refers to the combined weight of all diamonds in a piece of jewelry, not just a single stone. This measurement includes the center stone and any accent or side diamonds, giving a complete picture of the diamond weight featured in the item.
Accent Diamonds
Accent diamonds are smaller stones that surround or complement the center diamond. While they’re not the main focus, they enhance the overall brilliance, design, and sparkle of the jewelry piece. These diamonds are often used in the band, halo, or side settings.
Diamond Finish
Diamond Finish sample content
Metal Finish
Finish refers to the surface texture of a ring. We offer two finishes for our unisex ring designs.
High Polish
A sleek, shiny finish that creates a smooth, reflective surface, offering a timeless and elegant appearance.
Brushed Finish
A soft, matte finish with fine linear texture, achieved by hand-brushing the surface for a subtle and modern effect.
Both finishes can be applied to all metal colours and karats. It's important to note that both metal finishes may show wear over time and will require re-finishing to maintain their appearance.
High Polish
Brushed
Diamond Certificate
Diamond certification is a process in which a gemological laboratory assesses a diamond’s key attributes, including cut, colour, clarity, and carat weight. Certification provides an unbiased, detailed report about the diamond's quality, which in turn influences value.
GIA (Gemological Institute of America) and IGI (International Gemological Institute) are two leading certifiers, known for their rigorous grading standards and independent assessments, ensuring transparency in diamond purchases.
Pavé Band
Pavé (pronounced "pah-vay") is a French term meaning “paved”. Pavé designs can vary in stone sizes and widths. Different pavé techniques, such as variations in the number and shapes of claws, can change the visual effect of the stones or designs.
1/2 Pave
A 1/2 pavé band features stones set halfway around the ring.
3/4 Pave
A 3/4 pavé band has stones set three-quarters of the way around the ring.
The number of stones set will vary depending on the ring size. If you're concerned about your rings spinning, a 3/4 band offers more coverage. We do not offer full pavé bands, as stones on the inside of the hand are more prone to damage.
Bracelet Size
Bracelet Length
Chain bracelet sizing is based on total length (circumference).
To measure your wrist, use a flexible tape or string to find the length that fits comfortably, but isn’t too loose. Our chain bracelets have adjustable lengths.
Tennis bracelets fit at one length, designed to be flexible and allow movement. Worn slightly lower on the wrist, they may relax and stretch over time. If you're between sizes, consider sizing down.
Bangle sizes refer to the internal diameter, including both length and width for oval-shaped bangles. Our bangles do not have hinges.
When selecting a size consider the fit both over your hand and when on your wrist. To determine your size, tuck your thumb in and measure the widest point of your hand across the knuckles.
Oval bangles sit closer to the wrist, while round bangles will have more movement. Bangles cannot be resized, so view our sizing tips here. (Guide to come).
Chain (Necklace Size)
Length
The necklace length depends on personal style, and sizing varies for each person.Our chains begin from 40cm, which typically rests at the base of the neck or just above the collarbone.
Finer chains will more closely follow the contours of your décolletage, while heavier chains or pendants will hang straighter and longer.
Visit us to try on various lengths, or use a measured piece of string to find your perfect fit. For custom sizing advice, contact us.
Carat
Carat refers to the weight of a gemstone, not its size. A higher carat typically means a heavier and often larger-looking stone. (This is a sample description.)
Band Profile
Band profile refers to the shape of the ring’s band, known as the shank. Profile affects visual appearance, comfort, and stackability with other rings. We carefully design each profile to ensure both beauty and durability. While most rings come with a standard half-round band profile, some designs allow customisable profile options to better suit your personal style.
On our Bespoke Ring Builder, clients can customise and co-create our most coveted Signature Engagement Designs, selecting either a lab-grown or natural diamond from our extensive diamond inventory.
Following Signature Engagement Designs are available on our Bespoke Ring Builder:
Ceremonial Solitaire
Our most coveted design. A minimalist, high-profile basket setting that emphasises the focal stone.
Classic Solitaire
A modern take on a classic solitaire design. Featuring a high-profile basket setting, framed by sweeping cathedral shoulders on a tapering half-round band.
Signature Bezel Solitaire
A bold take on a solitaire design, featuring a central stone encased in a high-profile bezel setting.
Amira
A three-stone design, featuring your choice of centre stone shape accented by pear diamond accents. Crafted in a minimalist high-profile setting.
Cosmic Trio
A three-stone design, featuring your choice of centre stone shape accented by round diamond accents. Crafted in a high-profile open silhouette.
Bezel Amira
A bold take on our Amira design, featuring your choice of centre stone shape accented by pear diamond accents in a sleek bezel setting.
Bezel Cosmic Trio
A bold take on our Cosmic Trio design, featuring your choice of centre stone accented by round diamond accents in a sleek bezel setting.
Diamond Type
All LOUISE JEAN pieces are available in both Natural and Laboratory-Grown Diamonds, allowing you to choose based on personal preference. Both are genuine diamonds, indistinguishable in chemical, physical, and optical properties.
Natural Diamonds form over billions of years under intense pressure deep within the Earth, while Lab-Grown Diamonds are cultivated in controlled environments. Though of equal quality, they differ significantly in price.
Please note: This is a sample content for the Stone Type drawer.Explore our range of exquisite stones, each carefully selected for their unique beauty and brilliance.
Lab-Grown Diamond: An ethical and sustainable choice, lab-grown diamonds offer the same physical and chemical properties as natural diamonds.
Natural Diamond: Formed over billions of years, natural diamonds are a timeless symbol of love and strength.
Moissanite: Renowned for its incredible brilliance and fire, moissanite is a durable and dazzling alternative to diamonds.
Sapphire: A gemstone cherished for its vibrant blue hue, sapphires symbolize wisdom, loyalty, and nobility.
Each stone type offers a distinct charm — perfect for expressing your individual style and story.
Diamond
All LOUISE JEAN pieces are available in both Natural and Laboratory-Grown Diamonds, allowing you to choose based on personal preference. Both are genuine diamonds, indistinguishable in chemical, physical, and optical properties.
Natural Diamonds form over billions of years under intense pressure deep within the Earth, while Lab-Grown Diamonds are cultivated in controlled environments. Though of equal quality, they differ significantly in price.
The bail connects a pendant to a chain, playing a key role in design and functionality. For each LOUISE JEAN Bespoke Pendant, choose from a selection of bail types to match your personal style and needs. Bails come in various shapes and sizes, offering options to link to clasps or slide over different chains. Each Bespoke Pendant is customisable with your choice of bail, ensuring a perfect fit for your design.
Hinged Bail (11mm total length)
An oval-shaped bail with a square-edged profile. Features a hinged latch and can slide over a chain or attach to a link or clasp.
Knife Edge Bail (13mm total length)
A tapered bail with a knife-edge profile. Features an open design and can slide over a chain or attach to select swivel clasps.
Round Solitaire Designs
Solitaire designs with round diamond centre stones may feature your choice of either four or six talon shaped claws. This is a personal aesthetic preference, with little bearing on structure.
4-claw setting
6-claw setting
Orientation
Orientation refers to the angle at which the stones, often the centre stone, are set. We invite you to customise the orientation of the focal stone to create a unique design. While the most common setting is portrait (north-south), other popular options include east-west, a compass orientation, or even a custom angle. The orientation affects the appearance of the diamond shape, and can also change the way the ring sits and covers the finger.
Portrait
The most common choice in ring settings, stones are set vertically, with a portrait orientation (north-south)
East-West
For visual appeal and increased finger coverage, elongated stone shapes can be set horizontally in an east-west orientation. Available in most setting styles, including trilogies on request.
Diamond Ratio
The ratio of a diamond refers to the proportion of its length compared to its width, calculated by dividing length by width. A lower ratio results in a more plump, rounded stone, while a higher ratio gives a more elongated, slender appearance.
The ratio significantly impacts the visual appeal of a diamond and is a matter of personal preference. Square and round diamonds typically have a ratio of 1.0, while other shapes vary, with some ratios being more common than others.
Diamond Shape Ratios:
Oval Ratio
Cushion Ratio
Emerald Ratio
Marquise Ratio
Pear Ratio
Radiant Ratio
Round Ratio
Asscher Ratio
Diamond Certificate
Diamond certification is a process in which a gemological laboratory assesses a diamond’s key attributes, including cut, colour, clarity, and carat weight. Certification provides an unbiased, detailed report about the diamond's quality, which in turn influences value.
GIA (Gemological Institute of America) and IGI (International Gemological Institute) are two leading certifiers, known for their rigorous grading standards and independent assessments, ensuring transparency in diamond purchases.
Need Help
Choosing your dream diamond is a special process - and one worth doing right. With so many beautiful options available, we encourage you to select a diamond that truly stands out to you.
While quality, gradings, and beauty all play a part, your personal preference is just as important.
If you need help navigating our curated inventory or understanding what makes a diamond exceptional, our expert team is here to guide you.
For personalised advice, contact us - we’re here to help every step of the way.
Split your purchase into 4 interest-free payments, every two weeks. No fees when you pay on time. Available for orders under $2000.
Additional Design Elements
These bespoke touches allow you to personalise your ring and make it uniquely yours. Options include incorporating coloured diamonds or gemstones, adding pavé detailing along the band or rail, or including meaningful hidden elements.
You can also choose special personalisations such as engraving or a hidden gem set into the design - subtle details that make your piece all the more personal.
Metal
At LOUISE JEAN, we craft high-quality pieces using only precious metals: 9K, 14K, and 18K Yellow, Rose, White Gold, and Platinum. Our pieces are solid, with no plated or vermeil designs. Each metal karat has unique characteristics, including colour, hardness, and durability, to suit your aesthetic and lifestyle preferences. Our gold is sourced from a trusted supplier, certified by the Responsible Jewellery Council, and ensures ethical practices of Australian metal sourcing.
Engraving
Engraving can be added to any LOUISE JEAN ring. Use letters, numbers and roman numerals to personalise your piece, with up to 15 characters (including spaces). Engraving will be placed on the inside, at the base of your ring. Choose from three fonts to reflect your personal style. Engraving will appear exactly as entered so please be sure to double-check the details.
Note: Character limits may vary depending on ring style and size. Rings with engraving may be subject to reduced resizing parameters.
Wedding Date
Please provide your wedding date to help our team prioritise the timely creation of your rings. If you have another important deadline, like a departure or event date, let us know. By sharing your date, we can also send helpful aftercare reminders, including annual servicing. If you're unsure of the exact date, a general timeframe is sufficient.
If this ring is not intended for a wedding/event, you may leave this field blank.
Production Time Frames: Plain & Classic Wedding Rings: 5-6 weeks Diamond & Gemstone Wedding Rings: 7-10 weeks.
If your wedding date falls within these timeframes, we cannot guarantee delivery before your event.
For any timeline concerns, please reach out to our customer consultants via our live chat.
Hidden Gemstones
A hidden gem is a personalised touch that can be added to any ring, engagement or wedding. Available in coloured diamonds, gemstones, and many birthstones, up to 3 inlay gems can be included. Flush set on the inside of the band, they are typically positioned on the side of the shank, to the side of any stones or settings.
Most rings feature 1.2mm stones, wider or unisex rings with a band width of 3mm+ feature 1.5mm stones.
Inlay gems can also be placed on the outer surface of our Classic Ring, Cuff Ring, and Signet designs. Please leave a note at checkout with your preferred gem placement, and we will endeavour to accommodate your request while ensuring the structural integrity and durability of the piece. Our team will reach out to confirm the placement of gems before proceeding with production.
Compatibility
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