Nephrite "hei-tiki" (neck pendant). These are believed to have their own "mana", are handed down as valuable heirlooms, and often given as gifts to seal important agreements. It has also been used for a range of tools such as adzes, as Māori had no metal tools before European contact. Commonly called "greenstone", jade jewellery in Māori designs is widely popular with tourists. Stone is often imported from Canada, China and Siberia, and Ngai Tahu runs a pounamu certification scheme to verify the authenticity of New Zealand stone. Nephrite Nephrite is a variety of the calcium, magnesium, and iron-rich amphibole minerals tremolite
Guianan cock-of-the-rock their definitive plumage at around three years. Juvenile females look almost identical to their adult counterparts. Guianan cocks-of-the-rock have a total length of approximately and a total weight of around . The two species of cock-of-the-rock are allopatric, and therefore do not meet with one another. The plumage of male Andean is redder and its wings are mostly black, lacking the orange colouration seen on the male Guianan. The female Andean is reddish brown rather than the brownish-gray of the Guianan. The Guanian cock-of-the-rock is one of two species of genus "Rupicola". It was described by Carl Linnaeus in 1766