Common diamond shapes on engagement rings include circles, hearts and squares. Triangular diamonds also appear, but are overshadowed. They can be either brilliant or step cut, side stone or central diamond. Their shape may also be good for the budget conscious.

Triangular Diamonds - An Unsung ShapeTwinning is when a mineral forms one way before changing direction and growing another. Twinned diamonds, also called macles, take the form of flat triangles. While cutters may turn macles into round brilliants and other cuts, this sacrifices a lot of rough. Triangular diamonds preserve carat while forming beautiful jewels.

Brilliant cut triangles are known by many names, including trillions and trilliants. There is no one cut standard for triangular brilliants. Some may focus on increasing the white light reflected inside and others on prismatic effects. The shapes themselves may vary, with flat or curved sides and pointed, cropped or beveled corners.

Step cut triangular diamonds are made of nested facets. As with other step cut diamonds, they concentrate on the luster and clarity of the stone. Triangular diamonds tend to be shallow, highlighting internal characteristics. Step cut stones also draw attention to quirks in the jewel. A person looking at triangular step cuts may want to look at jewels with high clarity grades.

Triangular diamonds are popular side stones on diamond engagement rings. They’re mounted with their sides flat against the central jewel and taper down the shoulders. With flat edges, these stones will sit flush against squares, rectangles, and other straight sided jewels. If paired with shapes like ovals or circles, there may be decorative gaps.

When seeking a central jewel for their diamond rings, most people gravitate towards circles, squares or other shapes. Someone who wants their ring to stand out may want to consider a triangle as their main stone. The shape is uncommon as a center stone, so even as a solitaire it makes a statement. Possible side stones are also out of the ordinary. Instead of a single jewel on either side, triangles are paired with channel set jewels.

The recommended proportions for triangular diamonds is a 1:1 length to width ratio. They should have high clarity, or characteristics which appeal to you. The sides and corners should be equilateral, rather than irregular. If your triangle doesn’t have cropped corners, make sure the setting protects the points.