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Brazilian alexandrite (daylight at left; incandescent at right), emerald cut, 3.18 ct, 9.06 x 7.23 x 5.1 mm.

Brazilian alexandrite (daylight at left; incandescent at right), emerald cut, 3.18 ct, 9.06 x 7.23 x 5.1 mm.

Sillimanite isn't really known as a gemstone, even though it occasionally used in fine platinum and gold jewelry. Gemstone quality Sillimanite is somewhat rare, relatively expensive and for the most part, gemstone and jewelry collectors quickly snap up the small amounts of gems that makes it to the marketplace.

Sillimanite isn't really known as a gemstone, even though it occasionally used in fine platinum and gold jewelry. Gemstone quality Sillimanite is somewhat rare, relatively expensive and for the most part, gemstone and jewelry collectors quickly snap up the small amounts of gems that makes it to the marketplace.

Alexandrite is a stone of prosperity and longevity. It balances mind and emotions, pacifies soul and promotes spiritual growth. Alexandrite is a rare mineral variety ofAlexandrite Chrysoberyl. In the daylight it is of bluish-green or even emerald-green color, and in the artificial light it may be red, crimson, purple-red and violet-red.

Alexandrite is a stone of prosperity and longevity. It balances mind and emotions, pacifies soul and promotes spiritual growth. Alexandrite is a rare mineral variety ofAlexandrite Chrysoberyl. In the daylight it is of bluish-green or even emerald-green color, and in the artificial light it may be red, crimson, purple-red and violet-red.

Pink Graff Diamond ring

Pink Graff Diamond ring

Pulled synthetic alexandrite, Fig. 20.: Czochralski or pulled alexandrite looks very clean, but contains curved striations visible with magnification and stone color is bluish under the daylight

Pulled synthetic alexandrite, Fig. 20.: Czochralski or pulled alexandrite looks very clean, but contains curved striations visible with magnification and stone color is bluish under the daylight

5.33 carat color change garnet from Taita-Taveta (Madagascar) under natural daylight.

5.33 carat color change garnet from Taita-Taveta (Madagascar) under natural daylight.

Color change garnet (under incandescent light) from Taita-Taveta (Madagascar)

Color change garnet (under incandescent light) from Taita-Taveta (Madagascar)

Green fancy diamond

Green fancy diamond

Blue Zircon (Cambodia) Gem of superb quality displays a deeply saturated blue of the most desirable nature, surpassed only by its excellent transparency and luster. Long before scientists manufactured the first cubic zirconia gemstones, nature had already produced its own version—zircon. Only a few other gem materials equal the dispersed "fire" of zircon, diamond being one of them. Zircons of more than 10 carats are exceedingly rare.

Blue Zircon (Cambodia) Gem of superb quality displays a deeply saturated blue of the most desirable nature, surpassed only by its excellent transparency and luster. Long before scientists manufactured the first cubic zirconia gemstones, nature had already produced its own version—zircon. Only a few other gem materials equal the dispersed "fire" of zircon, diamond being one of them. Zircons of more than 10 carats are exceedingly rare.

The blue color of Benitoite is a very appealing color, and with its strong color dispersion, it makes it a desirable stone for collectors. It is very rarely seen in jewelry and when it is, it will be in expensive jewelry. This is in part due to the fact that gem quality material is rarely larger than 5 carats in size. One of the largest Benitoite gems weighs 7.50 carats, and was on display at the Smithsonian Institution for a period of time.

The blue color of Benitoite is a very appealing color, and with its strong color dispersion, it makes it a desirable stone for collectors. It is very rarely seen in jewelry and when it is, it will be in expensive jewelry. This is in part due to the fact that gem quality material is rarely larger than 5 carats in size. One of the largest Benitoite gems weighs 7.50 carats, and was on display at the Smithsonian Institution for a period of time.

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