The Vikings used pieces of Iolite to help them in their navigation. The Black Prince's Ruby in the British Crown Jewels is really a very fine natural Spinel. An Opal will cut glass just like a Diamond. Diamonds, Sapphires, Tourmalines, Zircons, and Spinels come in ALL colors. Diamond cutting is a grinding process and all that is left is the finished Diamond and dust.
Points are a measure of weight.
There are one hundred points in a carat just like cents in a dollar, and there are five carats in a gram. Karat refers to purity of Gold. A Ruby is a red Sapphire. Write us at Paradise Jewelry 5455 Airport Road N. Naples, Fl.