American Arts & Crafts Necklace by Louis Comfort Tiffany
18kt Gold, Lapis, Carnelian and Turquoise beads
signed

Tiffany was intriqued by opague stones, which do not filter light, he chose pebble shaped beads of Lapis, Carnelian, and Turquoise along with Gold hammered beads

This necklace is illustrated in The Jewelry & Enamel Work of Louis Compfrt Tiffany page 117 by Janet Zapata

A simimilar necklace with translucent beads is in the collection of the Metropolitain Museum of Art.