GEMSTONE GUIDE

Purple quartz and is one of the most popular gemstones. It varies from pale lavender to deep purple with red highlights. Amethyst is generally abundant and quite inexpensive. Amethyst is purple, lilac or mauve. The highest quality is transparent. It has a hardness of 7.

Light blue, blue-green and dark blue. The highest quality is transparent. It has a hardness of 7.5. Aquamarine often becomes paler if left out in the sun.

Slightly yellowish, and in this general color range, those most approaching absolute lack of color are most prized. However, brightly colored diamonds are much rarer and more expensive. The deep blue Hope diamond and blue Eugenie diamond, both in the Smithsonian collection, are among the most famous examples. It has a hardness of 10.

Medium to dark green beryl which derives its color from chromium and vanadium. Emerald has a hardness rating of 7.5. of fine color and clarity can be quite expensive. The best known sources include Colombia, Zambia. Almost all emeralds contain numerous small inclusions and fractures that promote fragility. Most stones on the market are impregnated with oils, waxes, or other substances to mask the fractures and sometimes enhance color.

Rare and the highest quality is known as imperial Jade. Jadeite comes in many colors: red, yellow, green, lilac, black, orange, white, pink, blue and brown. Jadeite has a hardness of 7. Nephrite Jade is more common and is often used in Chinese carvings. Nephrite Jade comes in various tones of green -- mostly with an olive green tone. It has a hardness of 6.5.

Rich-looking, affordable black stone. It is often mixed with pearls to create elegant jewelry. Onyx, sard, and sardonyx are all varieties of chalcedony (microcrystaline quartz). Onyx comes in brown, white, grey, and black. Sard is a reddish-brown variety. Sardonyx is a blend of sard and onyx with the red bands of sard and the white bands of onyx. Onyx, sard and sardonyx all have a hardness rating of 7.

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 of mussel. This then creates a pearl as layers of the inside of the shell grow over the added substance. The price of pearls vary widely as a result of luster, size, how they were grown, color and type. Natural pearls are the most expensive, followed by cultured pearls. Fresh water pearls tend to be relatively inexpensive. Pearls are generally white, brown, silver, cream, black or pink depending on the type of shellfish and water. Pearl has a hardness of 3.

Transparent lime or olive green. It has a hardness of 6.5. As with all gems, protect peridot from scratches and sharp blows. Also avoid large temperature changes (such as leaving it be a heater vent or in a hot car). Do not clean peridot in a home ultrasonic cleaner.

From the mineral corundum. All gem quality corundum that is not red is called sapphire such as blue, orange, yellow, violet, green, white and pink. 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. Sapphire has a hardness of 9. Generally, sapphire is quite durable. Still, sapphires are subject to chipping and fracture if handled roughly.

May be blue, purple or slate gray. Tanzanite has a hardness rating of 6.5. Tanzanite is often heat treated to improve its color and clarity. Tanzanite can easily be scratched or chipped. Clean your Tanzanite with warm, soapy water and a soft bristle brush. Avoid using ultrasonic cleaning.

Comes in many colors such as blue, yellow, pink, red, black, green and clear. It has a hardness of 7.5. As with all gems, protect tourmaline from scratches and sharp blows.

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 . It has a hardness of 7.5. Zircon is somewhat soft so avoid scratches and sharp blows. Avoid hot water and household chemicals.