Amethyst

Amethyst is a paranoid little gem, who is well aware of how valuable precious minerals and gemstones like amethysts and diamonds can be. In fact, that's exactly what causes Amethyst to be such an introverted little trinket. Because of what she knows about gemstones and their real-world value, she has a hard time trusting others, and will typically need to study them at a long distance in order to attempt to make a judgement as to whether or not she can trust their intents. Until she can trust others, though, she tends to keep a low profile and avoid making too much of a name for herself.