Africa Gem Gallery Africa

Bi-color Tourmaline Gemstones

Gem Gallery Africa - Image 20
One of the most popular gemstones of recent times, tourmaline is a wonderful gemstone that has many excellent properties. It occurs in almost every color imaginable, sometimes even with multiple colors in the same stone! Because of this huge variation in color it was often previously confused with other gems such as emerald and ruby. A wide variety of trace elements in the stone (such as manganese, iron and copper) are what cause the amazing range of colors. Most gem tourmaline is of the variety called elbaite. Major African sources for tourmaline include Mozambique, Zambia, Nigeria and Namibia. There are smaller deposits in Tanzania and Madagascar. Most of the sources produce stones of various colors. Bicolor (also known as watermelon tourmaline) is a rare variety of elbaite tourmaline that has multiple colors in the same gem. This is a completely natural phenomenon that occurs when the gem is forming. It results in some amazing looking gems. The most common two colors found together are pink and green (hence the name watermelon) but there are many different variations such as pink/blue, pink/white, green/white and so forth. Occasionally even three or more colors can be found in the same gem! Because of their rarity, bicolor tourmalines are one of the more valuable types of tourmaline. Bicolor tourmaline is usually cut into rectangles or long cushion cuts in order to show off the color split more clearly. Watermelon tourmaline that has a red or pink center and a green rind is cut and polished into slices in order to show off the colours. Tourmaline has a very good hardness of 7.5, making it great for all jewelry applications. Because the gem often forms as long slender crystals, the most common cuts for tourmaline are rectangles and emerald cuts. Tourmaline is sometimes heat-treated to improve the color. This treatment is permanent and undetectable and has no effect on value or durability. Tourmaline is the birthstone for October, along with opal.

Ref No: BIT0001

Weight: 5.49ct

Price: USD 1,372.00

Size: 19.6 x 6.1 x 4.9

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Ref No: BIT0002

Weight: 5.71ct

Price: USD 456.00

Size: 10.9 x 9.2 x 7.1

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Ref No: BIT0005

Weight: 2.69ct

Price: USD 269.00

Size: 11.3 x 6.3 x 4.5

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Ref No: BIT003

Weight: 6.41ct

Price: USD 1,602.00

Size: 15.7 x 7.5 x 6.8

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Ref No: BIT004

Weight: 4.06ct

Price: USD 527.00

Size: 13.1 x 6.2 x 5.4

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Ref No: BIT006

Weight: 2.60ct

Price: USD 364.00

Size: 11.0 x 6.7 x 5.1

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Ref No: BIT007

Weight: 2.42ct

Price: USD 290.00

Size: 10.9 x 6.7 x 4.7

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Ref No: BIT008

Weight: 4.47ct

Price: USD 536.00

Size: 11.3 x 9.1 x 6.7

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