Return to beryl (thing)

The beryl family is a large group of [mineral]s; it includes not only [aquamarine] and [emerald] but [goshenite], [heliodor], [morganite], and a lot of [gemstone] beryls which are just called by their color. Red beryl is extremely rare (more so than emeralds, by some reports), and blue beryl is quite interesting in that its color fades with exposure to [sunlight].