The name is derived from Ancient Greek that means "not intoxicated", a reference to the belief that the stone can prevent drunkenness. Amethyst is a variety of quartz. Its hues range from light pinkish violet to a deep purple ("deep Siberian"). "Green amethyst" is a misnomer for green quartz (prasiolite / vermarine / lime citrine). Natural amethyst is dichroic in reddish violet and bluish violet. Amethyst can be heat treated to improve the color or change it to citrine, but loses its dichroism, unlike genuine citrine. Because the process is not always uniform, mixing of amethyst purple colour and amethysts yellow can occur and is called ametrine. Natural occurrences of ametrine come from the Anahi mine in Bolivia. Amethyst gem stone can change color permanently if left in the sunlight for several hours.
The best varieties (rich purple color) of amethysts are found in Siberia, Sri Lanka, Uruguay (Artigas) and Zambia. Brazilian (Minas Gerais) stones can be found in huge sizes, but are generally moderate in color.
It is not a scarce gemstone. Value per carat does not rise exponentially with weight as it is readily available in large sizes. Value but depends almost entirely on color. Top prices are paid for "Siberian" deep purple with red and blue flashes.
|Refractive index||1.544 - 1.553|
Features of amethysts available from HeinRich
|Dimensions||oval: 7mm x 9mm x 5mm|
|Weight||1.95 carat, 0.39 grams|
|Origin||Uruguay (circa 2011)|
|Buy 1 for||R90|
|Shipping method||Number of items||Cost|
|Collect from Pretoria, Sunnyside||any||R 00|
|Courier to big cities, delivery 2-3 days||1 to 2||R 50|
|Courier to a town beyond 30 km from big cities, delivery 4-5 days||1 to 2||R143|
|SA post office to a town beyond 30 km from big cities, delivery 7 or more days||1||R 65|
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This page has been updated on the 2017-08-29.