since 1976
Rose-cut gemstones are gems with flat bottoms and domed checkerboard or faceted crowns. Many black gemstones, such as black spinel and black tourmaline are given a rose cut, to show off their luster. Also, some opaque gems,...
Cubic zirconia (CZ) is the cubic crystalline form of zirconium dioxide (ZrO2). The synthesized material is hard, optically flawless and usually colorless, but may be made in a variety of different colors. It should not be...