‘‘It is not about color,’’ said Joe Dan Lowry, co-author of ‘‘Turquoise: The World Story of a Fascinating Gemstone ... It is light blue to dark blue in color, with a ...

Turquoise blue has even been added to the color wheel between violet and green since the robin-egg-blue of good turquoise is quite pronounced even though the gemstone ... A light blue was made ...

Sacred to Indigenous people, beloved by collectors, one blue-green stone has huge cultural cachet in the “Land of Enchantment.” Indigenous artisans in New Mexico are known for their turquoise ...

Coral with accents of opal, sugilite, lapis lazuli, Orvil Jack turquoise, 14-karat gold, silver. Collection of Leota and Phil Knight. Photographer: Sam Franks A sky-blue colored stone with a gray ...

This fine stone powder absorbs the shortest wavelengths of light — the purples and indigos — and reflects mainly light-blue and green light back to the surface, giving the water a turquoise tint.