Opals, rubies, emeralds, diamonds, and sapphires are all minerals. In fact, all gems are minerals with the exception of pearls, which have a biological origin.
Yes, like the mineral Quartz is also a gem.
its an mineral
A sapphire gem is mainly composed of the mineral corundum and other trace mineral impurities that give it its color.
a diamond is a mineral (also is a gem)
Gem
Yes.
No, nickel is a mineral.
The web address of the Houston Gem And Mineral Society is: http://www.hgms.org
The web address of the Fallbrook Gem And Mineral Museum is: http://www.fgms.org
a gem
Opal and amber are not minerals.
Opal and amber are not minerals.