Aventurine

Adventurine is a variety of quartz that glitters when viewed from certain angles due to mica inclusions. Aventurine can be medium to light green, dark to pale blue, or a beautiful sparkling shade of gold. Faceting only detracted from the flash below the surface of this translucent stone, so it was tumbled smooth, cut cabochon, or used as an inlay. Large deposits of aventurine with twenty pound (nine kilogram) blocks were not uncommon. It was sometimes known as "love stone". A typical specimen had a base value of 50 gp.