Africa Gem Gallery Africa

Tourmaline Gemstones


Tourmaline gemstones

Tourmaline

One of the most popular gemstones of recent times, tourmaline is a wonderful gemstone that has many excellent features. 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. The name tourmaline comes from the Sinhalese word “turamali” which referred to a mix of gems with various colors. A wide variety of trace elements in the stone (such as manganese, iron and copper) are what cause this amazing color range. 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 individual sources produce stones of various colors. 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.

Pink Tourmaline

Pink tourmaline occurs in a wonderful range of hues. It can be light pastel pink right through to deep reddish pink. The most valuable pink tourmaline is a vivid medium to medium-dark reddish pink with no overtones. Brownish or orange-pinks are less valuable but can be equally beautiful and are well suited to someone looking for a more subdued or earthy color. Pink tourmaline is sometimes referred to as rubellite, though this name is generally reserved for intense red stones. Due to the increasing popularity of pastel toned gems such as morganite, pale pink tourmaline are also becoming very sought after.

Green and Blue-Green Tourmaline

Green tourmaline is one of the more frequently occurring colors of tourmaline as well as one of the most popular. It varies from pastel mint green to an intense bluish-green that resembles emerald. The most valuable green tourmaline are light or medium toned because they have the most brilliance. Very dark greens are quite inexpensive. Stones that have a blue overtone are more valuable than regular greens and olive stones. Intense green tourmaline containing chromium are referred to as chrome tourmaline.

Bicolor/Watermelon Tourmaline

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 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.

Fancy Tourmaline

Aside from the more conventional pink and green tourmalines, the gem is also found in a range of fancy colors. These include yellow, orange, grey, apricot, peach, white and black. If you are looking for a unique tourmaline, this is where to look!

Tourmaline Information:

Mineral Group: Tourmaline
Crystal Structure: Hexagonal
Hardness: 7-7.5
Luster: Vitreous
Specific Gravity: 3.06
Transparency: Transparent
Refractive Index: 1.616 - 1.650
Double Refraction: 0.018
Pleochroism: Strongly pleochroic
Treatments: Occasionally heat treated
Birthstone: October

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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Ref No: FTs0001

Weight: 1.45ct

Price: USD 101.00

Size: 7.2 x 5.1


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Ref No: FTs0002

Weight: 1.29ct

Price: USD 103.00

Size: 7.9 x 5.7 x 4.5


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Ref No: 2.65ct

Weight: 2.65ct

Price: USD 291.00

Size: 10.6 x 6.8 x 5.2


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Ref No: FTs0004

Weight: 1.52ct

Price: USD 106.00

Size: 7.2 x 5.2


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Ref No: FTs0005

Weight: 1.51ct

Price: USD 105.00

Size: 8.1 x 6.2 x 4.8


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Ref No: FTs0006

Weight: 2.35ct

Price: USD 188.00

Size: 9.7 x 7.7 x 5.1


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Ref No: FTs0007

Weight: 2.17ct

Price: USD 173.00

Size: 7.8 x 5.0


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Ref No: FTs0008

Weight: 1.87ct

Price: USD 187.00

Size: 7.5 x 5.7


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Ref No: FTs0009

Weight: 2.00ct

Price: USD 200.00

Size: 9.0 x 6.3 x 4.6


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Ref No: FTs0010

Weight: 2.61ct

Price: USD 261.00

Size: 12.0 x 7.5 x 5.8


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Ref No: FTs0011

Weight: 1.56ct

Price: USD 156.00

Size: 6.6 x 5.6


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Ref No: FTs0012

Weight: 0.94ct

Price: USD 37.00

Size: 6.1 x 4.3


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Ref No: FTm0013

Weight: 4.04ct

Price: USD 565.00

Size: 13.0 x 8.5 x 5.8


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Ref No: GRTm0017

Weight: 3.36ct

Price: USD 604.00

Size: 13.7 x 6.1 x 4.3


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Ref No: GRTm0018

Weight: 3.59ct

Price: USD 646.00

Size: 9.2 x 6.0


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Ref No: GRTm0019

Weight: 4.86ct

Price: USD 486.00

Size: 15.7 x 8.9 x 6.1


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Ref No: GRTm0020

Weight: 5.09ct

Price: USD 916.00

Size: 14.8 x 7.9 x 6.4


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Ref No: GRTm0021

Weight: 3.74ct

Price: USD 561.00

Size: 11.0 x 9.1 x 6.1


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Ref No: GRTm0022

Weight: 3.12ct

Price: USD 187.00

Size: 10.2 x 8.3 x 6.3


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Ref No: GRTm0023

Weight: 2.92ct

Price: USD 350.00

Size: 9.2 x 6.0


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Ref No: GRTm0024

Weight: 6.33ct

Price: USD 1,582.00

Size: 13.0 x 9.5 x 8.2


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Ref No: GRTm0025

Weight: 4.98ct

Price: USD 597.00

Size: 14.3 x 7.8 x 5.3


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Ref No: GRTm0026

Weight: 4.79ct (total)

Price: USD 574.00

Size: 13.3 x 5.1 x 4.2


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Ref No: GRTs0001

Weight: 2.83ct

Price: USD 113.00

Size: 13.0 x 5.5 x 4.1


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Ref No: GRTs0003

Weight: 2.13ct

Price: USD 127.00

Size: 12.0 x 6.6 x 4.5


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Ref No: GRTs0004

Weight: 0.85ct

Price: USD 51.00

Size: 7.2 x 5.1 x 3.7


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Ref No: GRTs0005

Weight: 1.68ct

Price: USD 84.00

Size: 8.5 x 5.5 x 4.6


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Ref No: GRTs0006

Weight: 1.43ct

Price: USD 85.00

Size: 8.0 x 6.1 x 4.6


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Ref No: GRTs0007

Weight: 2.05ct

Price: USD 123.00

Size: 9.1 x 7.2 x 5.0


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Ref No: GRTs0008

Weight: 1.44ct

Price: USD 100.00

Size: 7.2 x 5.2


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Ref No: GRTs0009

Weight: 2.24ct

Price: USD 156.00

Size: 10.2 x 6.2 x 4.7


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Ref No: GRTs0010

Weight: 1.56ct

Price: USD 156.00

Size: 8.7 x 5.7 x 4.0


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Ref No: GRTs0011

Weight: 2.04ct

Price: USD 142.00

Size: 9.2 x 7.2 x 5.3


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Ref No: GRTs0012

Weight: 1.08ct

Price: USD 86.00

Size: 6.5 x 4.5


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Ref No: GRTs0013

Weight: 1.51ct

Price: USD 90.00

Size: 6.9 x 4.7


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Ref No: GRTs0014

Weight: 1.44ct

Price: USD 216.00

Size: 7.0 x 4.7


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Ref No: GRTs0015

Weight: 2.32ct

Price: USD 185.00

Size: 10.0 x 5.9 x 4.6


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Ref No: GRTs0016

Weight: 2.27ct

Price: USD 158.00

Size: 7.6 x 5.6


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Ref No: GRTm0027

Weight: 3.31ct

Price: USD 827.00

Size: 12.8 x 6.3 x 4.8


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Ref No: GRT0028

Weight: 14.14ct

Price: USD 3,168.00

Size: 18.8 x 16.6 x 9.4


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Ref No: PTs0004

Weight: 0.85ct

Price: USD 51.00

Size: 6.0 x 4.2


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Ref No: PTs0005

Weight: 0.94ct

Price: USD 65.00

Size: 6.1 x 4.5


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Ref No: PTs0006

Weight: 2.06ct

Price: USD 164.00

Size: 8.7 x 6.7 x 5.8


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Ref No: PTs0007

Weight: 2.59ct

Price: USD 233.00

Size: 10.0 x 8.1 x 4.9


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Ref No: PTs0008

Weight: 1.32ct

Price: USD 105.00

Size: 8.1 x 6.1 x 4.3


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Ref No: PTs0009

Weight: 0.80ct

Price: USD 48.00

Size: 5.7 x 3.8


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Ref No: PTs0011

Weight: 2.01ct

Price: USD 201.00

Size: 9.0 x 6.8 x 5.3


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Ref No: PTs0012

Weight: 1.62ct

Price: USD 129.00

Size: 8.4 x 6.2 x 4.9


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Ref No: PTs0013

Weight: 1.64ct

Price: USD 180.00

Size: 8.6 x 6.7 x 4.7


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Ref No: PTs0003

Weight: 2.05ct

Price: USD 225.00

Size: 8.1 x 5.7


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Ref No: PTm0019

Weight: 3.29ct

Price: USD 493.00

Size: 9.4 x 6.5


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Ref No: PTm0020

Weight: 3.18ct

Price: USD 445.00

Size: 9.4 x 8.2 x 6.3


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