Identifying gemstones - The Australian Museum

Cut gemstones possess all the physical properties of the mineral from which they are cut, although the crystal shape is no longer evident.

Chalcedony - Wikipedia

Australian Gemstones

Identifying gemstones - The Australian Museum

All that glitters: the fossils of Lightning Ridge - Australian

Exclusive: Gem-like fossils reveal stunning new dinosaur species

Western Australian Museum in Perth City Centre - Tours and

Gemstone Unboxing

Gemstones: Discover the rare and valuable with Robin Hansen

New analysis traces origin of gems from Cleopatra's mines and

Gemstones and Minerals of Australia by Lin Sutherland