All gemstones that are not naturally occurring, that is found in the ground or in nature 's environments, are found within the CZ jewelry collection. These other non-natural gemstones include austrian crystal, glass, and other synthetics. Unlike their gemstone ring counterparts, the cubic zirconia rings are found within the same section as the cz bracelets, CZ pendants, and cubic zirconia earrings and necklaces. Cz's are available in over 30 distinctive colors at a CZ Jewlery retail store, however we at Plum Island carry the more hearty selling colors, namely the clear cubic zirconia, the pink cubic zirconia, the purple or lavender cubic zirconia, sapphire blue color, deep green, helios yellow, and ruby red. A sampling of the cz collection are named as follows: