Q: What is a Gemstone?

A gemstone is  commonly defined as naturally occurring form of a mineral which is desirable for its beauty, color hardness and rarity.  All together there are more than 30 popular varieties of gemstones, and many more which appeal to collectors for their rarity. In the gem and jewelry business all gemstones other than diamonds are called colored stones. If it isn't a diamond it's a 'colored stone'.   For centuries the term 'precious' has exclusively referred to four specific gemstones; the diamond, emerald, ruby and sapphire.  All other gemstones are considered to be 'semi-precious' regardless of how valuable they actually are.

Gemstones can be naturally mined, created in a laboratory or imitation. Gemstones created in a lab look identical to gemstones mined from the earth. The big difference is in the cost - laboratory-created stones are less expensive than naturally mined gemstones. But because they look just like gemstones mined from the earth, they must be identified as lab-created. Imitation gemstones resemble naturally mined stones but are not identical and are usually made of glass or plastic. Imitation gemstones must be identified as imitation. If you are purchasing a naturally mined gemstone, ask if it has been treated. Gemstone treatments - such as heating, dyeing or bleaching - can improve a stone's appearance or durability. Some treatments are permanent; some may create special care requirements. Treatments also may affect the stone's value.