Tiffany & Co. Interlocking circles lariat This vintage adjustable length Tiffany & Co. Sterling Silver Necklace Interlocking Circles is hard to come by. The chain features 2 interlocking circles threaded through a single circle. Tiffany & Co. 925 on clasp. 925 T&CO 1837 on each of the 3 circles. Chain, not including rings, measures 17.5 inches. Some minor scratches from previous use. Tiffany & Co. Jewelry Necklaces