was the key to their success. Why?.
Natural glass: obsidian and moldavite
Natural glass tends to be overlooked as a gemstone because of the extensive use of manufactured glass in gemstone
Sillimanite
For some time, this tough, durable gemstone has been either considered a collector's stone or used industrially (in the
Beryl
Few people can resist the glamour and intensity of the emerald. It is the gemstone that made Cleopatra's mines famous
Precious Gemstones
The definition of what constitutes a "precious" gemstone is a fluid thing changing with societies tastes, travels and
Corundum
The most important of the gem families, corundum provides us with two of the best-known stones: ruby and sapphire. The
Precious Black Opal
Black opal has a dark background, which can be dark grey, dark blue, dark green or grey-black - the darker the
Boulder Opal
Boulder opal is precious opal that has a sandstone or ironstone base.