Prasiolite (Green Amethyst) Straight Drilled Faceted Trillions measure approximately 9x10x10mm to 18x17x17mm in size, have a vitreous luster, superior faceting and exceptional polish, well matched for tone on strand, the shapes are symmetrical, and the transparent quality of the stones with the expert faceting reflects a high level of brilliance in the light mint green hued gemstones. Large & Luscious!