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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, such as lapis lazuli and...

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, such as lapis lazuli and...

Howlite is a basic calcium silico-borate. In its natural state it is white, and commonly marked with black, gray, or brown intersecting veins. It is often dyed to resemble other more expensive stones like turquoise and Lapis Lazuli. The stone is...