Tourmaline has seven color grades: red tourmaline, blue tourmaline, green tourmaline, multicolor tourmaline, brown tourmaline, colorless tourmaline and black tourmaline.

1, red tourmaline

Pink to red tourmaline. Red is the best tourmaline, with purple and rose. It is called Ruby, which is also called "Baby Face" in China. But in nature, brown, reddish brown, crimson and so on are produced more, and the color tone changes greatly. At the same time, the specific gravity of tourmaline will change with the color; Deep red has a higher specific gravity than pink.

2. Blue tourmaline

Light blue to dark blue tourmaline. Blue tourmaline is the most valuable color in tourmaline because of its rarity. Blue tourmaline is produced in yellow clay of weathered granite in Siberia, Russia, and also found in Brazil, Madagascar and the United States.

3. Green tourmaline

Green is the most common variety of tourmaline colors, so its value is not as good as that of blue and red tourmalines. Green tourmaline is mostly produced in Brazil, Tanzania and Namibia, while yellow tourmaline is distributed in Sri Lanka.

4. Multicolored tourmaline

Because tourmaline ribbons are very developed, red and green ribbons or tricolor ribbons often appear on a crystal. Common red and green gems, commonly known as "watermelon tourmaline", are deeply loved by collectors and consumers.

5. Brown tourmaline

Dark color, rich in chemical element magnesium. Brown tourmaline is mostly produced in Sri Lanka, North America, Brazil and Australia.

6. Colorless tourmaline

Colorless tourmaline is very rare, and only a small amount is produced in Madagascar and California. It should be noted that some colorless tourmalines on the market are made by heating and diluting pink tourmalines, but for colored gems, colorless tourmalines are of low value.

7. Black tourmaline

Black tourmaline is dark to pure black and opaque. It is usually a variety rich in iron or titanium and the most common tourmaline. Often used to replace coal jade or chalcedony, because of its large output and relatively low grade, the price is relatively low.