ametrine
trystine

Artificial ametrine can be created by differential heat treatment of amethyst.

When partially heated, amethyst can result in ametrine.

Green-yellow or golden-blue ametrine does not exist naturally.

The colour of the zones visible within ametrine are due to differing oxidation states of iron within the crystal.

Amethyst, tourmaline, citrine and aquamarine are among his favorite gems, along with ametrine, a stone that shades from purple to yellow.

Almost all commercially available ametrine is mined in Bolivia, although there are deposits being exploited in Brazil and India.

Limestone with veins of quartz and copper, basalt and deposits of ametrine and azurite.

Legend has it that ametrine was first introduced to Europe by a conquistador's gifts to the Spanish Queen, after he received a mine in Bolivia as a dowry when he married a princess from the native Ayoreos tribe.