Ametrine 6mm Round A Grade - 15-16 Inch Pebble If you are a collector

If you are a collector of cool rocks

colored by trace amounts of chromium and/or vanadium to range in hue from yellow to green to blue to green

the treated stones are cut

Tourmaline is classified as a semiprecious stone and occurs in a vast array of colors

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Ametrine 6mm Round A Grade - 15-16 Inch Pebble If you are a collectorAmetrine is quartz that occurs in bands of purple and yellow. As the name suggests, it is a combination of Amethyst and Citrine. The different colored zones in the stone result from different oxidation states of iron, due to exposure to different temperatures during its formation. It is believed that Ametrine was first introduced to Europe by a conquistadors gift from Bolivia to the Spanish Queen.