Trilliants or trillion cut diamonds, one of the fancy shapes, is produced from a unique, flatter type of rough.  This rough grows in the form of  ‘matching crystals’ and usually looks like two triangles placed on top of each other with a seam in between them.  Typically this kind of rough allows for a brilliant finish, producing a brilliant cut trillion.  This polishing will give her more shine and glamour.

Diamonds that are shaped like triangles are typically used as matching pairs for a center stone, but can also be used for diamond studs or other pieces of jewelry.