Tiffany & Co. 18k yellow gold diamond opal freshwater seed pearl necklace. 15 strands to the necklace with a large oval opal pendant surrounded by brilliant cut diamonds. The clasp encrusted with more diamonds and marked "Tiffany & Co. 18k". In original Tiffany & Co. necklace pouch. Attributed to Angela Cummings. Circa 1975. 
Weight: Approx. 62 grams / Diamonds weigh roughly around 0.8 carats 
Measurements: approx. Necklace: 16.75 inches length / Pearl: 3mm x 1.8mm / Opal: 0.9 inches x 0.75 inches x 0.24 inches 
Condition: No apparent condition issues to the pearls. The opal with an internal hairline. Age related wear and soiling to the necklace pouch. Please refer to photos.