Royal Amethyst
From Destinypedia, the Destiny wiki
Royal Amethyst is a redeemable item acquired in the House of Wolves. Royal Amethyst can be sold to Master Ives for glimmer. It comes in two varities: one worth 2500 glimmer, and one worth 5000 glimmer. Amethyst can be acquired either by playing through the House of Wolves storyline, or from the Queen's chest in the Prison of Elders.