Trillion

A trillion cut stone is a diamond or gemstone faceted in a curved triangular shape, with slightly convex sides rather than straight edges. The brilliant facet pattern is arranged across the triangular face to maximize light performance. Trillion cuts were developed in the late 1970s as a refinement of the basic triangle cut, and the name is a trademarked variation. Today it is used generically to describe rounded triangular brilliant cuts in fine jewelry.

The trillion cut was developed in Amsterdam in the late 1970s and introduced commercially in the early 1980s. The curved-sided triangular outline was a deliberate departure from the flat-edged triangles used previously, intended to improve face-up brilliance and reduce corner chipping risk. The shape was initially used for side stones in three-stone ring settings and later adopted for centre stones and pendants as demand for geometric fine jewelry grew.

Three-prong basket settings are the most common for trillion cut stones, with each prong positioned at a corner of the triangular outline. The corner placement distributes pressure evenly and protects the most vulnerable edges. Bezel settings are used for trillion pendants and earrings where corner protection must be more complete. Channel settings are not suitable for trillions because the shape's variable outline does not fit the uniform spacing channel settings require.

Trillion cut diamonds typically cost less per carat than round brilliant diamonds of equivalent quality because demand for the shape is lower and material loss during cutting is reduced. The broader face-up outline of a trillion means visible size at the surface appears larger than a round at the same carat weight, giving buyers more apparent stone for the spend. The trade-off is a smaller secondary market and fewer setting options compared with rounds.

Trillion cut stones are most commonly used as side stones in three-stone rings and as pendant centre stones where the angular geometry creates deliberate visual impact. Matched trillion stud earrings are a popular standalone choice because the face-up outline is clearly visible from the front. Bezel-set trillion stones provide corner protection for active daily wear. Browse gold earrings for trillion and angular stone styles in yellow, white, and rose gold.

Trillion and marquise side stones both taper to frame a centre stone but read differently in finished settings. Marquise stones are elongated with pointed ends that direct the eye horizontally, creating a wider band appearance. Trillion stones taper upward to a rounded peak, directing the eye toward the centre stone and keeping the band profile clean. Explore silver jewelry for trillion accent stone options at an accessible entry point.

Trillion cut stones work well as centre stones in rings designed to showcase geometric character. A trillion diamond or coloured gemstone as a centre reads as considered and unconventional compared with round or oval centres. The shape's broad face-up outline delivers strong colour saturation for coloured gems at moderate carat sizes. Browse cluster rings for multi-stone settings that incorporate triangular and trillion shapes alongside other geometric cuts.