What Is a Trilliant Diamond?

The Ultimate Buying Guide On Trilliant Diamond- History, 4Cs, Settings & Full Product Catalog

What You Will Learn in This Guide

• What a trilliant diamond is – definition, shape, and anatomy
• The full history of the trilliant cut – from Amsterdam to New York
• Trilliant vs. round diamond – key differences explained
• The 4Cs (Carat, Color, Clarity, Cut) for trilliant diamonds
• Best jewelry settings for trilliant diamonds
• Complete OM Jewels Inc trilliant diamond product catalog with full specifications
• Expert buying tips and frequently asked questions

What Is a Trilliant Diamond?

A Trilliant Cut Diamond – also called a trillion, trillian, or triangular brilliant – is a gemstone cut into a triangular shape with three equal sides. The name itself is derived from the combination of ‘triangular’ and ‘brilliant’, reflecting its hallmark light performance and striking geometric silhouette.

Unlike traditional round or cushion diamonds, the trilliant cut creates a bold, modern aesthetic with incredible visual presence. The triangular shape delivers a larger face-up surface area per carat than most other cuts, meaning you get more visible diamond for your money.

1-10 Carat Natural Diamond Price

The History of the Trilliant Diamond Cut

The trilliant cut has a rich history spanning more than a century, originating in the artistic diamond-cutting workshops of Amsterdam and evolving into one of the most distinctive fancy shapes in the modern market.

Origins: Amsterdam & the Asscher Brothers

Triangular diamond cuts are believed to have first appeared in Amsterdam as early as the 19th century, crafted by the famous Asscher brothers, who were pioneers in innovative diamond cutting techniques. These early triangular stones laid the foundation for what would become the trilliant cut.

1960s: The Modern Trilliant is Born

In the early 1960s, New York diamond manufacturer Leon Finker developed a refined version of the triangular brilliant cut, which he called the ‘trillion cut’. Around the same time, the Henry Meyer Diamond Company – which shared the same group of diamond cutters – was producing a slightly different version of the same shape, using the name ‘trilliant’.

1970s–1986: The Trademark Battle

In the 1970s, Finker’s son Marvin entered the business and decided to trademark the ‘Trillion’ name, while Henry Meyer’s firm held the ‘Trilliant’ trademark. In 1986, a federal court judge ruled that ‘trillion’ and ‘trilliant’ were phonetically equivalent and, since ‘trilliant’ is a contraction of the generic term ‘triangular brilliant’, neither could remain a registered trademark.

Today: A Universally Used Term

Since 1986, both ‘trillion’ and ‘trilliant’ are used freely across the industry to describe any triangular-shaped diamond, regardless of whether it has curved or straight sides, brilliant or step-cut facets. GIA officially uses the term ‘Triangular Brilliant’ in its grading reports.

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Anatomy of a Trilliant Diamond – Cut Variations Explained

A. Brilliant Cut Trilliant (Curved Sides)

This is the classic trilliant. It features three slightly curved sides that give the stone a softer, rounder triangular appearance. The brilliant-cut facet arrangement maximizes light return, fire, and scintillation. This version is most commonly used as a solitaire center stone or in three-stone ring designs. OM Jewels Inc’s Trilliant Diamond Pairs (PA-TR1, PA-TR2, PA-TR3) are brilliant-cut trilliants.

B. Step Cut Trilliant (Straight Sides)

The step cut version features three perfectly straight sides, creating sharp, angular points and a more geometric, architectural appearance. The step-cut facets produce mirror-like reflections and crisp lines rather than maximum sparkle – ideal for designers who value precision and clean geometry. OM Jewels Inc’s featured SKU BJ-1 (0.88CT Fancy Yellow) is a step-cut trilliant.

C. Facet Count by Cut Type

Trilliant Diamond vs. Round Diamond – Full Comparison

Understanding how the trilliant compares to the round brilliant helps buyers make an informed decision based on their priorities – whether that’s maximum fire, visual size, uniqueness, or value.

The 4Cs of Trilliant Diamond – A Detailed Buyer’s Guide

Carat Weight

Trilliant diamonds are available across a wide range of carat weights. Because of their triangular shape and shallow depth profile, they appear visually larger than a round diamond of the same carat. OM Jewels Inc’s trilliant inventory ranges from 0.69CT matched pairs all the way up to a striking 2.21CT single stone.

Color

The triangular shape can make the color slightly more visible than in a round brilliant. For a classic white look, choose D–H color grades. Near-colorless I–J grades offer excellent value. Warm tones (K–M) and Fancy Yellow Trilliant Diamond is uniquely beautiful in this shape – the open table and sharp geometry make the color vivid and dramatic. OM Jewels Inc’s BJ-1 (Fancy Yellow, VVS2) is a perfect example of how color elevates the trilliant shape.

Complete Useful 4CS Diamond Guide

Clarity

The trilliant’s wide, open table can make inclusions more visible than in a round brilliant. Aim for VS1–VS2 for eye-clean stones at a competitive price. VVS grades (like OM Jewels Inc’s BJ-1 and several pair offerings) offer exceptional transparency. SI1 can be acceptable if the stone is eye-clean – OM Jewels Inc’s BA-1 (2.21CT, SI1) is a good example of a large stone where SI1 clarity remains attractive.

Cut / Proportions

GIA does not assign a cut grade for trilliant diamonds, so proportions are assessed individually. The key metrics to evaluate are:

OM Jewels Inc – Complete Trilliant Diamond Product Catalog

OM Jewels Inc, located in New York’s Diamond District (20 W 47th St, Suite 405), stocks a comprehensive selection of natural trilliant and triangular-cut diamonds across both Fancy Shape and Pairs Inventory categories. All products are available at wholesale pricing – login or contact for price details.

Natural Fancy Shape – Trilliant & Triangular Diamonds

Trilliant Diamond Matching Pairs – Pairs Inventory

Perfectly matched trilliant pairs for earrings, three-stone rings, and custom symmetric designs:

Best Jewelry Settings for Trilliant Diamond

Three-Stone Engagement Ring

The most iconic use of Trilliant Diamonds is as side stones in a three-stone ring, flanking a larger round, oval, or cushion center diamond. The contrasting geometric shape creates a beautifully balanced look. OM Jewels Inc’s matched trilliant pairs (0.69CT, 0.70CT, 0.81CT) are specifically designed for this application – same color, clarity, and dimensions for perfect symmetry.

Solitaire Engagement Ring

A single trilliant diamond as a solitaire center stone makes a bold, fashion-forward statement. A three-prong or V-prong bezel setting protects the corners while showcasing the full triangular silhouette. OM Jewels Inc’s larger stones (1.03CT, 1.08CT, 2.21CT) are ideal for this use.

Diamond Stud Earrings

Matched trilliant pairs create geometric, modern stud earrings unlike anything on the market. The symmetrical triangular shape catches light from every angle. OM Jewels Inc’s 4.60×4.60MM and 4.75×4.75MM pairs are perfectly calibrated for earring studs.

Pendant / Necklace

A large single trilliant – like OM Jewels Inc’s 2.21CT (BA-1)- set as a pendant creates a dramatic, one-of-a-kind necklace. The wide triangular face catches light and draws attention in a way very few other diamond shapes can match.

Designer & Fashion Jewelry

The clean geometry of the trilliant cut – especially in step-cut form (like BJ-1) – is increasingly used by fine jewelry designers for architectural, avant-garde pieces. Its graphic, triangular silhouette translates beautifully into cocktail rings, brooches, and layered pendants.

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How to Buy Trilliant Diamond from OM Jewels Inc

OM Jewels Inc Service Benefits

• GIA & IGI Certified Natural Diamonds – authenticity guaranteed
• Wholesale Pricing – competitive rates for jewelers, designers & retailers
• Flexible Memo Programs – try before you buy arrangements available
• Bulk Order Special Discounts – ideal for jewelry manufacturers
• Easy Returns & After-Sales Support – hassle-free buying experience
• Quick Order Fulfillment – fast shipping from New York
• Bespoke Custom Diamond Creation – specific requirements? We cut to order
• Multiple Payment Options – Apple Pay, Credit Card, Debit Card, PayPal

Expert Buying Tips for Trilliant Diamond

1. Always protect the corners: The three pointed corners of a trilliant diamond are its most vulnerable areas. Always choose a setting with V-prongs, a three-prong basket, or a corner bezel that physically shields each tip from chipping.
2. Verify the L: W ratio: A perfect 1:1 equilateral ratio is the gold standard. Even a slight deviation can make the stone look lopsided. OM Jewels Inc’s inventory is proportioned to ideal specifications.
3. Check depth carefully: Depth below 32% creates a ‘fish-eye’ effect (flat, lifeless appearance). Above 50% depth buries weight and reduces the size face-up. The 38-46% range delivers the best balance of size and brilliance.
4. Embrace warm colors: K, L, or Fancy Yellow trilliants are often stunning because the wide open table displays the color beautifully. Many buyers find the warmth of a K-color trilliant (like BA-1) more attractive than a cold, colorless stone.
5. Buy matched pairs from inventory, not custom: If you need trilliant side stones or earrings, always buy a pre-matched pair from OM Jewels Inc’s Pairs Inventory – color, clarity, and dimensions are already verified as identical, saving significant time and cost.

Checklist Before Buying a Diamond

Frequently Asked Questions (FAQ)

Q1:  What is a trilliant diamond?

A trilliant diamond is a triangular-shaped diamond cut that combines three equal sides with either brilliant or step-cut facets. Also called ‘trillion cut’ or ‘triangular brilliant’, it delivers exceptional brilliance and a bold, modern look.

Q2:  What is the difference between a trilliant and a trillion-cut diamond?

‘Trilliant’ was the name trademarked by Henry Meyer Diamond Company, while ‘Trillion’ was trademarked by Leon Finker. After the trademark was cancelled in 1986, both terms are now used interchangeably to describe any triangular brilliant-cut diamond.

Q3:  Are trilliant diamonds more affordable than round diamonds?

Yes. Trilliant diamonds are generally 20-40% less expensive than round brilliants of the same carat weight, while offering a larger face-up appearance. This makes them an excellent value for buyers who want size and uniqueness at a competitive price.

Q4:  What jewelry settings work best for trilliant diamonds?

Three-prong or V-prong settings work best as they protect the three sharp corners. Three-stone rings (with trilliant side stones), solitaire rings, stud earrings, and pendants are all popular settings. OM Jewels Inc offers pre-matched trilliant pairs perfect for earring designs.

Q5:  Are OM Jewels Inc trilliant diamonds certified?

OM Jewels Inc supplies GIA and IGI-certified natural diamonds, ensuring complete authenticity and accurate grading. Each diamond is carefully selected to meet professional quality standards.

Q6:  How do I care for a trilliant diamond?

Avoid ultrasonic cleaners if the diamond has SI or lower clarity inclusions. Clean with a soft brush and mild soapy water. Store separately to prevent scratching. The corners of trilliant diamonds are vulnerable, so ensure the setting has proper corner protection.

Q7:  Can trilliant diamonds be used as center stones?

Absolutely. While trilliant diamonds are commonly used as side stones, they make stunning center stones in solitaire and three-stone rings. A 1CT+ trilliant like OM Jewels Inc’s BA-1 (2.21CT) creates a dramatic, show-stopping centerpiece.

Q8:  What is the ideal L: W ratio for a trilliant diamond?

The ideal length-to-width ratio for a trilliant diamond is 1:1 – a perfectly equilateral triangle. This ensures balanced proportions and maximum visual symmetry. OM Jewels Inc’s inventory adheres to ideal cutting proportions.

Why Choose OM Jewels Inc for Trilliant Diamonds?

OM Jewels Inc is a trusted wholesale diamond supplier based in New York’s Diamond District, serving jewelers, designers, and retailers worldwide since its founding. When it comes to trilliant and triangular-cut diamonds specifically, OM Jewels Inc offers:

Conclusion

The trilliant diamond is one of the most visually striking and underappreciated diamond cuts available today. Its bold triangular silhouette, larger face-up size, and relatively affordable price point make it an ideal choice for buyers who want something unique, modern, and full of personality – without compromising on brilliance or quality.

Whether you are looking for a single-statement solitaire, a perfectly matched pair for earrings, or premium side stones for a three-stone ring, OM Jewels Inc provides a carefully curated selection of natural trilliant and triangular diamonds to suit every design requirement and budget.