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Show Amethyst's Colors. A man recently brought back to m Jewelry store three rings set with urne-thysts urne-thysts which had faded to a pale yellow yel-low within a few months after he had bought them. lie then discovered that Instead of amethysts the gems were tnpnze. The latter vary In color from pale yellow to deep violet and purple. Under high temperatures amethysts change color, becoming first yellow, then green, nnd .llimlly entirely colorless. color-less. Under ordinary temperatures, however, genuine amethysts do not change color. |