Vintage Birks faceted graduated Onyx bead necklace with 14 KT pearl and sapphire clasp. The smallest faceted bead is 9 mm and the largest is 12 mm, in between each faceted beads is a tiny onyx 2 mm seed bead. The 14 kt clasp is 14 mm wide, set with a 6.5 mm Akoya cultured pearl, and three 2 mm round sapphires that appear black in regular light. Birks was established in 1879 in Montreal, Canada, and is a very well known, high end jeweler. The beads have some minor dings, I photo'd the largest, which is still hard to see.
I can restring this necklace with knots to extend to 16 inches for purchaser at no charge.