Exclusively Ours! Irene Neuwirth Diamond Collection's One-of-a-Kind 18k gold necklace sparkles with Colombian emeralds, aquamarines and tourmaline in various shapes and sizes. Gemstones rest in pronged settings. 51.79 ct aquamarines, 34.63 ct Colombian emeralds, 1.42 ct tourmaline. 18k gold. 18.5" chain length, approximately; 43mm drop, approximately. Hook-and-eye style clasp with safety latch.