Natural Gemstones: Reference Facts
Watermelon Tourmaline
Tourmaline is a very special and fascinating gemstone. Besides being found in a wide range of colors, tourmaline also has two or more colors in the same piece. Stones with two colors are called 'Bicolor Tourmaline'. Stones with a pink center and a green rim, or vice-versa, are called 'Watermelon Tourmaline'. Watermelon tourmaline is the unusual and rare variety of tourmaline. The coloring resembles the pink flesh and green rind of a watermelon. The watermelon tourmaline crystals are often cut cross-section into thin slices to show a distinct concentric triangular or hexagonal pattern where a pink core is surrounded by a green rind.
In good qualities watermelon tourmalines are much coveted treasures. They are desirable stones by gemstone lovers and collectors. An eye-flawless faceted watermelon tourmaline that has a strong red and green in approximately equal amounts is the most sought after, and will command the highest price. If you are come across a fine watermelon tourmaline, go for it. You will certainly enjoy this beautiful, valuable and rare gemstone.
Tourmaline is believed to strengthen the body and spirit, and protect the wearer against dangers and misfortune. Watermelon tourmaline balances the male/female energies and is useful for attracting love. It is also thought to enhance inspiration and encourage self confidence.
| Watermelon Tourmaline Known Facts
|
| Color |
Pink and Green
|
| Clarity
|
Type II – usually eye clean with some inclusions under magnification
|
| Crystal Structure
|
Trigonal
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| Chemical Composition
|
Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 - Complex borosilicate
|
| Luster
|
Vitreous
|
| Optic Character
|
Doubly Refractive
|
| Durability
|
Very Good
|
| Specific Gravity(SG)
|
3.06
|
| Refractive Index(RI)
|
1.62-1.64
|
| Birefringence
|
0.018
|
| Hardness
|
7.5
|
| Occurrence
|
Brazil, South Africa, East Africa, Sri Lanka, Madagascar
|
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