AfricaGem 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

View Details
Ref No: BIT0002
Weight: 5.71ct
Price: USD 456.00
Size: 10.9 x 9.2 x 7.1

View Details
Ref No: BIT0005
Weight: 2.69ct
Price: USD 269.00
Size: 11.3 x 6.3 x 4.5

View Details
Ref No: BIT003
Weight: 6.41ct
Price: USD 1,602.00
Size: 15.7 x 7.5 x 6.8

View Details
Ref No: BIT004
Weight: 4.06ct
Price: USD 527.00
Size: 13.1 x 6.2 x 5.4

View Details
Ref No: BIT006
Weight: 2.60ct
Price: USD 364.00
Size: 11.0 x 6.7 x 5.1

View Details
Ref No: BIT007
Weight: 2.42ct
Price: USD 290.00
Size: 10.9 x 6.7 x 4.7

View Details
Ref No: BIT008
Weight: 4.47ct
Price: USD 536.00
Size: 11.3 x 9.1 x 6.7

View Details