Chalcedony 12x20-13x25mm Free Form Oval Beads - 15-16 InchBlue Chalcedony is a naturally occurring soft blue translucent stone. It is a member of the Quartz family, a form of silica with a cryptocrystalline structure that incorporates Moganite along with the Quartz. Known in antiquity as the Speakers Stone, it is believed to have been worn Cicero, the great Roman orator.

Lapis was ground and processed to make the pigment ultramarine for use in frescoes and oil painting

Authentic Egyptian Turquoise remains difficult to source

It is known for its colors -- dark green and mustardy yellow

revered by ancient civilizations as a sacred stone of protection

It is mined in Peru

known as sheet silicates because they form in distinct layers

Natural Turquoise may be cut and polished

and forms around pieces of sand or other irritations within such a mollusc’s shell to create pearls

and Turquoise

high-silica content

but it can also occur as orange

containing sodium