A 4.20 carat black spinel 18K yellow gold over sterling silver 18-inch necklace measuring approximately 0.37 inches wide with lobster claw clasp and 2-inch extender - the black spinel necklace in warm gold where the deep black stones create dramatic contrast against the warm yellow metal. Black spinel's genuine vitreous luster differentiates it from black CZ - a real gemstone with depth and surface quality that simulants cannot replicate. At 4.20 carats along a warm gold chain. Lobster claw with 2-inch extender.