Bow guard, comprising a sand-cast openwork rectangular silver plaque set with single turquoise mounted on a black leather wrist strap, with two buckled straps for fastening around wrist: North America, USA, New Mexico, Navajo, c. 1940s

Flat, silver belt buckle, with hinged loop and hook-catch, the front decorated with Anasazi style geometric design in overlay technique with a mounted turquoise stone, marked 'Lomadapki': North America, USA, Arizona, Flagstaff, Hopi, by Bob Lomadapki, 1992

Brooch or pendant, comprising clusterwork turquoise inlay on a pierced circular shape, with nine flat silver pendants with oval turquoise mounts: North America, USA, New Mexico, Zuni Pueblo, Zuni, by Betty Estate, 1992

Concave oval pierced finger ring, of silver, with needlepoint turquoise inlay, centre reverse engraved 'EZT': North America, USA, New Mexico, Zuni Pueblo, Zuni, by Edith Tsabetsaye, 1992

Necklace consisting of turquoise, lapis lazuli, and carnelian ribbed lentoid beads, excavated in Tomb 72, Cemetery A: Ancient Egyptian, Middle Egypt, Haraga, Middle Kingdom, c.1880-1750 BC

Necklace consisting of a string of beads in turquoise, lapis lazuli, carnelian and blue-green frit, excavated in Tomb 72, Cemetery A: Ancient Egyptian, Middle Egypt, Haraga, Middle Kingdom, c.1880-1750 BC

Bracelet of silver set with turquoises, tourmalines, aquamarines and a cultured pearl: English, London, by Gerda Flöckinger, 1968

Snuff bottle of turquoise, flattened oval carved in relief with pine branches and birds, and with a turquoise stopper fitted with spoon: China, Republican Period, 1912 - 1949 AD

Woman's finger ring of brass, with the bezel set with a turquoise: Bhutan

Woman's finger ring of brass, with the bezel set with a turquoise: Bhutan

Woman's earring of brass, a coiled hoop with a soldered teardrop shape with turquoise insets: Asia, South Asia, Bhutan

Woman's gau (charm case) of brass, encrusted with turquoises in geometrical forms: South Asia: Bhutan

Silver earring (akor), one of a pair, with three main sections, decorated with pale turquoise stones (some missing): China, Tibet Autonomous Region, Lhasa, c.19th century

Silver earring (akor), one of a pair, with three main sections, decorated with pale turquoise stones (one missing): China, Tibet Autonomous Region, Lhasa, c.19th century

Gau (amulet box) cover of silver, flattened diamond shape with filigree decoration set with turquoise, stylised dorje on lower edge and suspension loops on upper edge, and with separate base, worn by a woman for spiritual protection: Nepal, Tibetan, 19th century AD

Gau (charm box) cover of silver, with the central part decorated with silver filigree and encrusted with turquoises, and a tubular loop above for a cord to suspend it round the neck: South Asia, Nepal