Do you think you have an understanding of what the most valuable gemstones are? Here's a list of the TOP 20 RAREST GEMSTONES in the WORLD

Australia is the most famous source of opals in the world. The black opals from Lightning Ridge are the most valuable opals ever produced. Journey with us on this expedition to the Australian outback to see how these rugged individuals mine opals and why they chase the rainbow of color.

1.91 Ct Rare Blue Grandidierite Rough --by Kel's Minerals

Lapis lazuli, a rare, deep blue gemstone. Lapis lazuli is a complex mineral containing a mixture of blue lazurite (sodium aluminium silicate), white calcite (calcium carbonate) and small amounts of other minerals.

Want to impress your friend with your rock knowledge? Here are 30 types of rocks that you ought to know to get you started.

What is the Peace Diamond, and how will its sale by auction on December 4, 2017 save countless lives? Learn more about this unique diamond here.

Anyone interested in geeking out on rare, natural minerals and stones will want to head directly to the Wilensky gallery, located in New York City's Chelsea

1. Night Pearls are a rare form of fluorite that is naturally luminescent, almost as tough as diamonds, and feature prominently in Chinese legends.