Bicolor tourmaline is a tourmaline that exhibits two colors in one stone.
There are various color combinations and patterns, and each stone is different, so it is easy to enjoy the unique feeling of this gemstone.

The mineral information of tourmaline is as follows.

English name tourmaline
Japanese name Tourmaline
classification silicate minerals
crystal system Hexagonal system (trigonal system)
mohs hardness 7 - 7.5
specific gravity 3.03 - 3.31 *Varies greatly depending on type
refractive index 1.61 - 1.64 *Varies depending on type
*Chemical composition is omitted as it varies depending on the type.

Generally speaking, pink and green seem to be the most common combinations, but there are also other combinations such as colorless and green, pink and blue, and the combinations and balances vary.

The combination of green and pink that looks like a watermelon is called watermelon tourmaline.

●Those with deep and vivid colors ●Things with high transparency without inclusions, scratches, or chips ●Things with a beautiful cut ●The larger the size, the higher the value.

The evaluation will also change depending on the balance of the two colors and how they are used.

The main production areas are America, Brazil, etc.

There are various theories about the origin of the name tourmaline, but the most famous theory is that it comes from the Sri Lankan Sinhala word Turamali (jewel sand reki).
"Bi-" comes from the Latin meaning "two," and bicolor tourmaline means "two-colored tourmaline."

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