Trillion Cut or Trilliant Cut Diamond? – Triangular Cut Diamonds

Trilliant cut Trillion cut diamond

What are Trilliant cut or Trillion cut diamonds?

Trillion cut is a popular expression for a specific gemstone shape. There are many variations for triangular types of gemstone cut. 

Alternative names for triangular shaped diamonds include Trillion shaped diamonds and Trilliant shaped diamonds. Misspellings include ‘Trilion cut’ and diamond reports usually refer to a Triangular modified brilliant cut.

What is a Trilliant diamond?

The name ‘Trilliant diamond’ comes from a combination of ‘Triangle’ and ‘Brilliant’. Triangle refers to the shape, whilst Brilliant refers to the angular faceting which gives the diamond its brightness. The antique alternative to this diamond shape was the step-cut triangular baguette. Dating from the 1920’s this shape is no longer cut commercially. Trilliant cut diamonds typically have around 44 facets. They are cut with either straight sides or curved sides.

Straight sided and curved sided Trilliant cut diamonds

Showing a straight-sided Trilliant-cut diamond and a curved sided Trilliant-cut diamond. 

Ideal Cut Trilliant diamonds

The ideal cut of a Trilliant ensures one-third of the diamond’s weight is above the girdle. Two-thirds of the weight should be below the girdle.  Many Trilliant-cut diamonds feature thicker girdles with 50% of the weight below the girdle and 50% above. The resulting proportions result in reduced brilliance.

Trilliant cut diamonds for 3 stone engagement rings

Trilliant cut diamonds are sometimes used as side stones when cut in pairs. They are most suited either side of another brilliant cut. The design below shows a Princess cut and Trilliant cut three stone engagement ring.  The ‘Tess’ design mixes both shaped beautifully with a perfectly balanced three stone Trellis setting.

Selecting diamonds for a princess cut and trilliant cut diamond engagement ring
Selecting the Trilliant cut diamonds for the engagement ring

Trilliant cut side stones within three stone engagement ring
Picture of engagement ring with Princess cut and Trilliant cut diamonds

Sourcing Trillion Diamonds

If you’re interested in buying a Trillion cut diamond, please feel welcome to get in touch. Our dedicated diamond concierge service sources your perfect diamonds, or select your design from our extensive products available to view through our shop.

Live chat and email support are available most days for help and guidance.

Mark Johnson

About Mark Johnson

Mark attended Liverpool University and went on to pursue a career in the diamond industry. After more than a decade working in polished diamonds, Mark moved to the Isle of Wight where he launched Serendipity Diamonds. He works most days from their busy Ryde showroom, photographing jewellery and writing for the Serendipity Diamonds website.

Mark Johnson

About Mark Johnson

Mark attended Liverpool University and went on to pursue a career in the diamond industry. After more than a decade working in polished diamonds, Mark moved to the Isle of Wight where he launched Serendipity Diamonds. He works most days from their busy Ryde showroom, photographing jewellery and writing for the Serendipity Diamonds website.