Looking at tourmaline through sunlight, the reflected light is a little pink.

Looking at rubies through the sun, the color is red.

2. Difficulties

Tourmaline belongs to tourmaline, and its density is generally between 7 and 7.5.

Ruby is second only to diamond in hardness and density of 9, but it is a relatively hard gem in nature.

3. Refractive index

The refractive index of tourmaline is between 1.62 and 1.64.

The refractive index of ruby is above 1.7. Under strong light, ruby will emit beautiful fluorescence, while tourmaline will not have this phenomenon.

4. Internal structure

Crystal, melt, fluid and fingerprint inclusions are common in ruby, which will affect the fire color and transparency of ruby. In addition, the cleavage of ruby is more developed, so it is called "ten Hong Jiu cracks".

There are common tubular fibers in tourmaline, which are cracked but inseparable.