Roberto Coin Hollow Diamond Series Bracelet RC. Roberto Coin's elegant and luxurious full-diamond hollow diamond-shaped floral geometric pendant earrings, short necklaces, long necklaces, and sweater chain sets are made of brass materials with gold-plated and silver options. The bracelet measures approximately 17.5 cm in length with a 2 cm extension chain and a tag weight of about 5 g; the short necklace is approximately 40 cm long with a 3 cm extension chain and a tag weight of about 7 g; the sweater chain is about 85.5 cm long with a 5 cm extension chain and a tag weight of about 10 g; the earrings measure approximately 2 cm x 2 cm with a weight of about 6.9 g; the large flower pendant on the sweater chain is approximately 3 cm x 3 cm x 0.5 cm, and the bracelet and short necklace pendant measures approximately 2.2 cm x 2.2 cm x 0.2 cm.