What color are pearls? What pearl color is rarest? Explore various pearl colors found naturally (and not naturally!) 

What are precious gems and how do they differ from semi-precious ones? Discover the difference here.

From rare diamonds to common onyx, explore 14 black gemstones, their meanings, how they form and how to care for them.

Read this beginner's guide to gemstone certifications to see how getting one can help you buy, sell and get appraisals for your gems.

Discover how this timeless gem is created and graded and the symbolism behind these legendary “mermaid tears.”