Idocrase or Vesuvianite Heart Briolettes measure approximately 7x7mm graduating up to 11x11mm in size, have a vitreous luster, have a great polish, have excellent faceting creating a very symmetrical shape, are translucent with minor internal characteristics, and gems are the highly sought after strongly yellowish medium-dark green hue. Discovered adjacent to lavas on Mount Vesuvius, hence its name. AAA