Tourmaline, is often referred to as the Rainbow Gemstone, and according to an old Egyptian legend, 'tourmaline on its long journey up from the centre of the Earth, passed over a rainbow'. The reality is that tourmalines are made of mixed crystals of aluminium boron silicate.

Diamonds by themselves are white and colorless but when a ray of light hits them they come to life with a sparkle of rainbow colors. Other lesser known gemstones like Sphene have a body color of their own but also show rainbow colors due to dispersion.