yellow beaded necklace

3

A citrine and diamond necklace by Cartier, circa 1935 (top) and a gold and citrine necklace by Tony Duquette (middle).

The Cartier necklace, like most “citrine” jewelry, is actually made with amethyst, heat-treated to obtain its rich orange-brown color. The Tony Duquette necklace uses actual citrine, which is naturally pale yellow to yellow-brown. Both citrine and amethyst are forms of quartz, colored by the presence of iron; they sometimes occur together in the same crystal, called ametrine, used to make the beads in the necklace by Verdura (bottom).