Nephrite Buttons. Nephrite is one of two different mineral species called jade. The other mineral species known as jade is jadeite, which is a variety of pyroxene. While nephrite jade possesses mainly grays and greens (and occasionally yellows, browns or whites), jadeite jade, which is rarer, can also contain blacks, reds, pinks and violets. Nephrite jade is an ornamental stone used in carvings, beads, or cabochon cut gemstones. It is also the official state mineral of Wyoming. Reference: Wikipedia
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Below are some examples and price guides of nephrite buttons including a set of six nephrite scarab buttons and an antique Chinese Flower button.