This is an impressive 11ct ceylon blue Daniel Steiger created Diamondeau, our exclusive substitute for natural mined diamond. In a remarkable trilliant cut shape. Trilliant cut gemstones are triangular shaped stones that are usually faceted based on the brilliant cut, hence the name. Due to their regular form, trilliants return substantial light and color to the eye. Trilliants are considered nearly as brilliant as round cuts, so are a good choice for buyers who like brilliance but want something other than round.