Art Deco Opal Bead Necklace White 18K Gold Jeweled Pave Diamonds/Emeralds Clasp

vintage necklace - art deco - likely dates from 1910's to the late 1920's. beautiful opal necklace. amazing clasp. 100% genuine. 18K white gold, real opals and pave set diamond + square cut emeralds clasp. also dark blue sapphires. lovely good quality opals - nice lustre and color. has the 'rainbow' play of color in the opal beads. this is a high quality necklace. no markings other than an number etched on the back. condition is great - one diamond missing - see below. nothing noticeable. likely what jewelers called normal wear. one missing diamond - just noticed this in the photos - could be replaced easily. these diamonds are likely 'mine cut' diamonds.