About turquoise: The name turquoise means "Turkish stone" because the trade route that brought it to Europe came via Turkey. Turquoise is a non-translucent stone of which the most valuable specimens are robin's egg blue or deep-blue azure. It also comes in brown, yellow, and many shades of green. The veins are inclusions from nearby rock fragments or oxides that form during the creation of turquoise.
Turquoise, the gemstone worn by pharaohs and Aztec kings, is probably one of the oldest gemstones known. Native Americans and many of the Indian tribes in Mexico used turquoise for currency, and the stone is still associated with the religious rites of the Navajo. Because it remains fashionable, turquoise is quite highly prized, although it is fairly plentiful.