Tigers eye:
noun
1.A golden-brown chatoyant stone used for ornament, formed by the alteration of crocidolite, and consisting essentially of quartz colored by iron oxide.
2. A glass coating or glaze giving the covered object the appearance of this stone.
A Tigers eye is a Quartz soldier that is exclusive to blue and yellow diamonds. The blue variant being called eagle eye. As diamond rule has gone on for millennia, it has grown more difficult to control every quadrant of space. This is where Tigers and Eagle eye come in. Created to make decisions like a diamond, these Quartz are often seen in the farthest reaches of space. They deal with situations that require diamond attention, such as a new conquest, or ending rebellions. Usually these gems are few and rarely ever meet another of their kind. They oversee large army forces and are also tasked with supplying reinforcement in case of war.
These gems are often seen as the closest to the diamonds, 2nd to their pearls. Eternally loyal.