Amethyst Amethyst is purple quartz and is one of the most popular gemstones. It varies from pale lavender to deep purple with red highlights.	Citrine Citrine is yellow to brown quartz. It varies from pale yellow to rich golden yellow to dark orange. Although citrine may occur naturally, much is produced by heating amethyst under controlled conditions.	Diamond As diamonds are formed by nature, they come in a variety of colors; generally speaking, the more highly prized are those that are as near to colorless as possible.
Emerald Emeralds are medium to dark green. The best known sources include Colombia, Zambia. Emeralds of fine color and clarity can be quite expensive.	Garnet Garnets usually dark brownish to purplish red. There are various types of garnet with the hardness ranging from 7 - 7.5.	Jade There are two types of Jade: Jadeite and Nephrite. Jadeite is rarer and the highest quality is known as imperial Jade. Nephrite Jade is more common and Jade comes in various tones of green.
Onyx Onyx is a rich-looking, affordable black stone. It is often mixed with pearls to create elegant jewelry. Onyx comes in brown, white, grey, and black.	Opal Opal in large sizes are rare and costly, especially black opal.Values are normally determined by the presence and nature of color flashes .	Pearl Pearls are formed in shellfish, as a reactant to an irritant such as a piece of sand. Cultured pearls are created by adding a piece of mussel or shell inside of an oyster or mussel. Natural pearls are the most expensive, followed by cultured pearls. Fresh water pearls tend to be relatively inexpensive.
Peridot Peridot is a transparent lime or olive green.	Ruby Ruby may be any color of red depending on the chromium and iron content of the stone.	Sapphire Unless a color is stated, sapphire is assumed to be blue. Some sapphires (color change sapphires) will change between blue and violet depending on the light.
Tanzanite Tanzanite may be blue, purple or slate gray.	Topaz Topaz comes in many colors such as blue, yellow, pink, brown, green and clear. Orange-red "Imperial" topaz is rare.	Zircon Zircon is a natural stone - not to be confused with Cubic Zirconia which is manmade. It is known as a colorless stone used to imitate diamonds but also comes in: blue, yellow, orange, red, brown and green.

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