4x6 mm Dendritic Opal Table Cut Corner Drilled Cube - 15-16 InchThis variety of opal is named "dendritic" for the small inclusions within it that resemble moss or ferns. These inclusions consist of iron, manganese and other metallic oxides captured during the forming of the rock. Opals are hydrated amorphous forms of silica, created when silica hardens within the fissures of other stones.

olive green and gray to green

until the 17th century Crystal Quartz was believed to be permanently frozen water

as opposed to the presence of Chromium which creates Emerald’s green color

mostly known for its green varieties

” Tourmaline is unusual in that it is both pyroelectric and piezoelectric

Most commonly mined in Madagascar

" an allusion to the moon-like white reflections of the mineral or to the quality of the light transmitted from the stone

but also for industrial purposes from watch gears and scientific instruments to sandpaper and other abrasives

Ruby was valued more highly than any other gem

Sometimes called the "Black Prince's Ruby" for its role in the English crown

Jaspers are considered elemental earth stones

and may also be referred to as Jacktree