Zircon is not a very well-known gemstone, but it is one of the most important gemstones of today.
Topaz makes an ideal gem. A good hardness and desirable colors, combined with a relative abundance.
A pearl Gems is a solid object composed of calcium carbonate which is secreted by an oyster after it encounters an irritant. However,
Emeralds are mineral compounds, combining silicate of aluminum and beryllium. Their colour is either light or deep green.