HomeLifestyleTrillion Cut Diamonds front and center Guide

Trillion Cut Diamonds front and center Guide

 Trillion cut diamonds are an attractive alternative to more traditionally cut gemstones, especially for those who wish to break tradition. Leon Finker created the trillion cut in the 1960s after being inspired by other triangularly cut diamonds. Though “trillion” could not be trademarked, the title remained relevant. To this day, nearly all triangle-shaped diamonds are known as trillion cuts due to their “tri” or three sides. Leon Finker may not have been able to trademark “trillion,” but in the 1970s, his son Marvin was able to trademark the “Treille” title.

In later years, “brilliant” and “triangle” were used by diamond connoisseurs to describe the trillion cut, thus giving this gem a new title. When you look at the trillion cut diamond, it’s easy to see why these words were used. The diamond’s unmistakable triangle features pointed corners and straight, or at times, rounded sides. Trillion cut diamonds can also be called “triangle diamonds” or “trilliant-cut” diamonds.


Engagement ring settings usually use diamonds for the center stone, but trillion cut diamonds are more likely to be seen as an accent item. Triangular diamonds are a popular option for side stones or solitaires, rarely taking center stage. However, with much searching, you can find an engagement ring that keeps trillion cut diamonds front and center.

Trillion cut diamond in an Engagement ring by Diamonds-USA

Trillion Cut Diamond Facets

What is a facet? The most straightforward explanation is as follows. Facets are smooth surfaces on a diamond that are machine or hand-created. The facets appear flat or curved and are seen in an attractive pattern around the gem’s face. Facets allow your diamond to create optical effects and dazzling brilliance in collaboration with light.

Depending on the location, trillion-cut diamonds usually have 30-60 facets, depending on the craftsman’s style. A center stone will always contain more facets, giving the buyer the illusion of a larger gemstone. These facets are strategically placed to increase the brilliance factor, boosting the wearer’s confidence. Side accents have fewer facets, so they don’t detract from the center stone. There is too much of a good thing!

A diamond’s weight distribution is always horizontally focused, so check the trillion cut diamond’s depth. They have a shallower depth than other gemstones and, when placed right, seem like they’re more valuable than they are. Trillion cut diamonds have a certain level of craftsmanship, adding to the lack of depth. With a shallower trilliant, flaws can be seen easily. You’ll find the trilliant’s depth should be between 38%-45%. This is why it’s essential to be educated on what to look for, as many buyers end up with a sub-par diamond once the initial sheen wears off.

Price of Trillion Cut Diamonds

If you’re on a budget, you’ll adore the trillion cut diamond, which seems more prominent than what it weighs. This is a popular option for young couples who want a diamond looks more expensive than it is. This shape can have the same carat as a more traditional cut and still look more significant, especially with added color. These diamonds can cost less than rounder cuts, making them a good option for those looking to make waves without breaking the bank.

Trillion cut diamonds are priced based on their carat, shine, and craftsmanship. Your trillion cut diamond’s price will vary based on where it’s placed in the jewelry and its size. As always, the heavier the rock, the higher the price.

How Rare Are Trillion Cut Diamonds?

As previously stated, trillion cut diamonds are likelier to be used in accents, making them a rare option for center diamonds. Those who prefer this diamond cut are actually among the minority. Studies show triangular cut diamonds were the least popular cut out of 12 tested diamond shapes. Though trillion cut diamonds are technically in last place for preference, they’ve increased in popularity as many see them as modern, yet classic.

Buyers looking to stand out from the crowd will adore having this rare cut in their earrings, bracelets, necklaces, and engagement rings. With triangular edges and light-reflecting angles, you’ll be the star of the show.

What to Look for?

When searching for Trillion Cut Diamonds at Diamonds-USA, keep an eye out for gems that you find most attractive. Try to keep the depth % between 37% and 45% for best brilliance and luster. Your perspective may differ from someone else’s, so trust your inner compass.

Once you see the diamond’s video, you’ll want to test for quality. Here’s how.


Triangular-cut diamonds have facets starting at the center of the gem and spreading out to the edge of the gemstone. These facets can hide inclusions or bits of material inside the gemstone. Checking clarity grade is always the best way to look for inclusions or lack thereof. Depending on your budget, you may be okay with an inclusion or two if it means saving a few dollars.

You should also evaluate the color. The Gemological Institute of America (GIA) believes the best diamonds are colorless, white, or fall into a specific hue range. Most buyers tend to agree. Diamonds that fall under this category are free of nitrogen impurities, which often appear yellow or brown. This doesn’t apply to diamonds that are supposed to be colored and are frequently considered top-notch. You’ll find these diamonds in light yellow, pink, purple, violet, or grey hues.


What is symmetry? Symmetry refers to the length between each diamond’s sides. Trilliant needs to include sides and angles that are equal in all aspects. These diamonds usually have sharp corners, but some dealers will cut corners to increase the longevity of the gemstone. Keep in mind that, as with all things, there is a tradeoff – the diamond may look different with cut corners and, in some opinions, not as attractive.

Treadmill-cut diamonds can sometimes have straight sides, but they can also have rounded edges. Many buyers prefer rounded sides, as they keep with a traditional, feminine center stone appearance. Straight edges are seen as strong, abstract, and geometric, giving the diamond a hint of edge. These edges may appeal to a younger generation who wants something different than the family heirloom.

Trillion cut diamonds are shallower than traditional cuts and shapes, and you should always look at the L/W (length-to-width) ratio. This determines that the patterns are appropriately cut for the diamond. When patterns are properly cut, the diamond not only looks better, but it able to withstand wear and tear.

Are you looking for a trillion cut diamond to place in an engagement ring, necklace, or earrings? Diamonds-USA gemologists would be happy to assist you.

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