Amareth

Amareth, known as the Lustrous, is a dragon from an unknown distant plane.

History
When dragons age on this particular plane, their scales harden over time, turning into a beautiful crystal. Amareth has been around for a long time, longer than any other dragon, and she takes immense pride in her glistening scales. So much pride, in fact, that she takes no interest in hoarding boring gold — she exclusively hoards gems and crystals as lustrous as herself. If people stumble upon her lair and make no attempt to take anything for themselves, Amareth will happily spend hours showing them the highlights of her collection.