Black Hills Gold Butterfly Necklace Authentic Black Hills Gold Butterfly Necklace. 12k rose-gold and 12k green-gold leaves as wings of a 10k gold butterfly. Butterfly comes on an 18 inch Gold Filled Rope Chain with spring ring clasp for ease and comfort. Pendant measures 9/16" X 9/16" inch. Usually ships 2 to 3 business days. Our jewelry becomes brighter and prettier the more it is worn. Clean with soft brush and mild soap only. Limited Lifetime Warranty from the manufacture