was the key to their success. Why?.
Demantoid
A green variant of Garnet, or more accurately, the rarest, most valuable, most brilliant of green garnets. Exceedingly
Hematite
The metallic silver-grey crystal surfaces of specular hematite are so highly reflective that they were used in the past
Orthoclase Feldspar
Orthoclase is a moderately cheap transparent stone that is colourless or pale yellow and can have a bluish white
Physical Properties of Gemstone Material
An understanding of the optical and physical properties of the material is a prerequisite to knowing the best ways of
Lapis lazuli
Lapis lazuli translates from the Arabic as "heaven (or sky) stone" - it was clearly held in high regard in ancient
Natural glass: obsidian and moldavite
Natural glass tends to be overlooked as a gemstone because of the extensive use of manufactured glass in gemstone
Precious Black Opal
Black opal has a dark background, which can be dark grey, dark blue, dark green or grey-black - the darker the
