Types of Gemstones
There are three basic classifications for gemstones. The first are precious gems. This category includes diamonds, rubies, emeralds, and sapphires. They are rare and therefore considered to be the most expensive. The second class of gemstones are called semi-precious. Semi-precious gemstones include the majority of crystals that are most commonly found and sold. Some semi-precious stones are actually considered more valuable than some precious gems. The third category of gemstones are those that are created and developed from organic matter. This includes fossils, pearls, amber, and coral.
Humans have valued gemstones since the beginning of time, long before currency was ever created.
Precious Gemstones: Diamonds, Rubies, Emeralds, and Sapphires