"A Black Onyx necklace is a true embodiment of sophistication and elegance. This gem necklace is handcrafted in 14k gold and features a rectangular Black Onyx gemstone in prongs. Everything about this yellow gold necklace is to love - it is versatile and totally wearable from day until evening. ♥ Gemstone Type - Black Onyx ♥ Gemstone Size - 13x18mm ♥ Gemstone Cut - Rectangle - More options available in the drop down menu ♥ Metal Type (Main Photo) - 14k Gold Filled - More options available in the