Turquoise, Opal, Tourmaline and Diamond Necklace

Turquoise, Opal, Tourmaline and Diamond Necklace
sterling silver, the pendant mounted with an oval cabochon-cut turquoise weighing approximately 49.9 carats, accented on the border by oval cabochon-cut opals weighing approximately 1.16 carats in total, oval- and pear-cut tourmalines weighing approximately 0.74 carats in total, round-cut turquoises weighing approximately 0.16 carats in total, and rose-cut diamonds weighing approximately 0.50 carats in total, l. 2-1/4", suspended from an opal necklace composed of opal roundels ranging in size from 2.7 mm to 5.4 mm, finished with a diamond clasp, l. 18". total weight 23.3 grams
Condition Report: In overall very good condition with no missing or loose stones.