Tiffany & Co. Opal, Cultured Pearl and Diamond Choker Necklace

"White opal plaque, cultured pearls of approximately 3.45 - 3.20 mm, round diamonds, signed Tiffany & Co., blue Tiffany & Co. envelope pouch

Opal: measuring approximately 24.80 x 21.20 x 4.84 mm with approximate total weight of 14.00 - 15.00 carats

Size/Dimensions: 33 cm (13 in)
Gross Weight: 56.9 grams" - Christie's