Some of the most beautiful jewelry is made using semi-precious gem stones. A gem stone is a mineral, a rock or a petrified material that is cut or faceted and polished before it can be used in jewelry.
Some gem stones are fairly rare, such as amazonite, which is a bright green variety of feldspar. Formerly it was obtained almost exclusively from Russia, but recently it was found in Colorado and Madagascar. Its limited occurrence makes it prized as a gem stone.
Citrin, also called citrin quartz, is an amber colored gem stone.
Aventurine is commonly a green gem stone, but can be orange, brown, yellow or grey. The rarest is red and highly prized as a gem stone.
Cordierite is a magnesium, iron and aluminum cyclosilicate, the transparent variety of which is iolite, which is used as a gem stone. The name, iolite, is derived from the Greek word for violet.
Lapis lazuli is a stone which has been classified as a gem stone. This deep blue gem stone dates back to the pharaohs of ancient Egypt.
Jade is an interesting gem stone. The name is applied to two different silicate materials. It is a very tough material and was first used for axe...
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