Gems as names?

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What do you guys think about using gems as names? Ruby, Pearl, and Opal have been around for ages. Jade and Amber are newer ones. Recently I have seen several girls named Diamond and a sweet lady came in to the store last night with the name Beryl (another word for emerald.) I kind of like Garnet as a name. All the ones I can think of seem to work for girls only. Are there any gem inspired names that might sound good for a boy? 

Birthstones in order: Garnet, Amethyst, Aquamarine, Diamond, Emerald, Pearl, Ruby, Peridot, Sapphire, Opal, Topaz, Zircon. Most peopleknow these. Some other gems/minerals: Onyx, Citrine, Cobalt, Galena, Lorimar, Schorl. Which are your favorites?