Tiffany & Co. 18k Heart Pendant Multichain Necklace Authentic necklace from Tiffany & Co. It is crafted from 18k yellow gold. The pendant is an open heart with a smooth form and has twelve strand of classic link chain on each side and it is loop through the heart and attached to the toggle clasp bar. Signed Tiffany & Co. 750. Weight: 42.1 grams. Measurements: 16 inches long. Very good conditions. Upon Request, Auction House may provide an appraisal. This will carry an additional cost. Appraisals are made by our in house GIA certified Gemologist.