Trillion cut diamonds were first developed in Amsterdam, and often traditionally used as side stones to a larger solitaire on engagement rings. However, for the more adventurous spirit, the trillion cut diamond makes a perfect center stone as it can hold it's own with no problem. The trillion shape is a brilliant cut, which means that it catches the light well which is what gives it that sparkle and fire.
The exact design of trillion cut diamonds truly depends on two things: the skill and preference of the cutter and the natural characteristics of the stone. The diamond can be a triangle with pointed corners, or more rounded, with 25 facets on the crown, and 19 facets on the pavilion. The crown is the upper part of the diamond above the girdle. The girdle is the narrow rim around the diamond.