Coral Mineral, Gemstone Geology, Properties, Formation

Coral is skeletal material produced by marine animals. Coral is organic and created by living organisms. The hardened skeleton remains and this material is used as a gemstone.

Aragonite, Carbonate, Calcium, Crystals

Olivine: A rock-forming mineral. Used as the gemstone peridot.

Rose Quartz Healing Properties, Facts and Photos

Amber - Types,Formation,Sources,Properties,Test,Value

63 Types of Black Gemstones - TPS Blog

silica group of gemstones

Gemstones of the World - Fifth Edition

Coral Gemstone: Meaning, Properties, Value & Information

Gemopedia - Gemstone Encyclopedia