This is a beautiful vintage double strand necklace made of aurora borealis crystals. The necklace has a sterling silver clasp. The beads range in size from 4 mm to 14 mm. The crystals have a wonderful iridescence. The necklace measures 21 inches long. The necklace is heavy and weighs 163 grams. It is in very good condition but the sterling clasp does have an age patina and may need cleaning or polishing. This is a fabulous necklace and my pictures simply do not do it justice. Please let me know if you have any questions. Thanks for stopping by.