This is the ultimate sapphire necklace. It is made with 222 carats of natural, mostly untreated, sapphires, umba sapphires, which are rare and untreated, including the center sapphire, which is multicolored multifaceted sparkly & opalescent! Pictures do no justice!! Sparkling and colorful and gorgeous. All metal solid 18 K for 14 K gold – lobster clasp is 18 K solid gold end beads are 14 K solid gold.