A crimson egg shaped gem with silvery swirls covering it's surface. They sometimes are known to give of a very faint magical aura.
History
Not much is known about where these gems came from or how they were created.
They started to become popular with the nobility of Waterdeep after The Dragon Wars.
The Trollskull Crushers received one as a prize for winning the team combat event during the Day of Wonders from Azerty.