What is the rarest gem – Hydrogen Zone

Question: What is the rarest gem
- Keywords:
  gem,
  rarest
Asked by redagonflame to Lindsay, Jeff on 23 May 2015.
- K. Lindsay Hunter answered on 23 May 2015:
  
  I confess, I had to ask Google to help me on this one. One of my best friends is really into gems and crystals, so it seems that I have a LOT more to learn from her!
  
  Apparently, this is a hard question to answer since not everyone agrees on what “rare” should mean. However, there is a gem called musgravite (so rare, I hadn’t even heard of it!) that only has had about 8 specimens ever found (as of 2005)! The Gemological Institute of America (GIA) calls musgravite “a rarity among the rare”!
  
  Rarest gemstones:
  http://news.discovery.com/earth/weather-extreme-events/rarest-gemstones-in-the-world.htm

Question: What is the rarest gem