There are a lot of guys out there, selling "Green Amethyst" so I am leaving an article I found on e-by-that is good.: Buyers Beware:
Amethyst is the purple form of quartz. Amethyst is purple and only purple. Amethyst can range from pale lilac to deep purple. There is no ''green'' amethyst. The heating of less valuable pale amethyst stones turn the gem a green color. The treated stone should be marketed as green quartz, not green amethyst, and it is not as rare as the manufacturer would have you believe. There is no shortage of pale amethyst that can be heated to acheive the green color.
Amethyst is a popular choice for jewelry due to its beautiful color, affordability, sizes, and versatility. The quality amethysts have a clear purple color and are transparent. Amethyst is found in geodes all over the world. Amethysts are the birthstones for February and are recommended for the 4th and 6th wedding anniversaries.
The orange or yellow form of quartz is citrine. The name comes from the French word for lemon, "citron". Brazil is the leading producer of naturally mined citrine, however most citrine on the market today has been heat treated to enhance its color. Citrine comes in a full range of orange hues, from bright orange to pale brown. It is a bright and cheerly color and goes wonderfully in the spring.
Ametrine is both amethyst and citrine in one stone, it is bi colored quartz. The ametrine stone is usually cut in a rectangular shape to show both the yellow and purple colors. Bolivia produces the finest quality ametrine in the world.
Amethyst, citrine & ametrine can be found in most places in the world including Argentina, Australia, Brazil, Bolivia, Namibia, Uruguay, the US and Zambia. Amethyst, citrine and ametrine rank 6.5 to 7.5 on the Mohs scale. In many cases darkers stones have been heat treated, which is a common practice with gems and the treatment is permanent.
When buying an amethyst, citrine or ametrine look at the color and the clarity of the gemstone. A high quality stone will be colorful, bright, and transparent. Depending on what part of the quartz the stone has been cut from will dertermine how clear the final stone will be. The more clear the stone the higher its value will be.
Clean amethysts, citrine and ametrine with warm, soapy water and a soft brush or an ultrasonic cleaner. Do not use any type of commercial cleaners.
Keep your amethyst, citrine and ametrine jewelry in a fabric-lined box. You should always keep your jewelry items separate from each other to avoid any scratches.
Amethyst is only one of several quartz varieties. Other varieties that form macroscopic (large enough to see) crystals are as follows:
Citrine is a yellow to orange gemstone variety that is rare in nature but is often created by heating Amethyst.
Milky Quartz is the cloudy white variety.
Prasiolite is the leek-green variety, rare in nature but used as a gemstone, sometimes (wrongly) called Green Amethyst.
Rock crystal is the clear variety that is also used as a gemstone.
Rose quartz is a pink to reddish pink variety.
Smoky quartz is the brown to gray variety.
Amethyst is the purple form of quartz. Amethyst is purple and only purple. Amethyst can range from pale lilac to deep purple. There is no ''green'' amethyst. The heating of less valuable pale amethyst stones turn the gem a green color. The treated stone should be marketed as green quartz, not green amethyst, and it is not as rare as the manufacturer would have you believe. There is no shortage of pale amethyst that can be heated to acheive the green color.
Amethyst is a popular choice for jewelry due to its beautiful color, affordability, sizes, and versatility. The quality amethysts have a clear purple color and are transparent. Amethyst is found in geodes all over the world. Amethysts are the birthstones for February and are recommended for the 4th and 6th wedding anniversaries.
The orange or yellow form of quartz is citrine. The name comes from the French word for lemon, "citron". Brazil is the leading producer of naturally mined citrine, however most citrine on the market today has been heat treated to enhance its color. Citrine comes in a full range of orange hues, from bright orange to pale brown. It is a bright and cheerly color and goes wonderfully in the spring.
Ametrine is both amethyst and citrine in one stone, it is bi colored quartz. The ametrine stone is usually cut in a rectangular shape to show both the yellow and purple colors. Bolivia produces the finest quality ametrine in the world.
Amethyst, citrine & ametrine can be found in most places in the world including Argentina, Australia, Brazil, Bolivia, Namibia, Uruguay, the US and Zambia. Amethyst, citrine and ametrine rank 6.5 to 7.5 on the Mohs scale. In many cases darkers stones have been heat treated, which is a common practice with gems and the treatment is permanent.
When buying an amethyst, citrine or ametrine look at the color and the clarity of the gemstone. A high quality stone will be colorful, bright, and transparent. Depending on what part of the quartz the stone has been cut from will dertermine how clear the final stone will be. The more clear the stone the higher its value will be.
Clean amethysts, citrine and ametrine with warm, soapy water and a soft brush or an ultrasonic cleaner. Do not use any type of commercial cleaners.
Keep your amethyst, citrine and ametrine jewelry in a fabric-lined box. You should always keep your jewelry items separate from each other to avoid any scratches.
Amethyst is only one of several quartz varieties. Other varieties that form macroscopic (large enough to see) crystals are as follows:
Citrine is a yellow to orange gemstone variety that is rare in nature but is often created by heating Amethyst.
Milky Quartz is the cloudy white variety.
Prasiolite is the leek-green variety, rare in nature but used as a gemstone, sometimes (wrongly) called Green Amethyst.
Rock crystal is the clear variety that is also used as a gemstone.
Rose quartz is a pink to reddish pink variety.
Smoky quartz is the brown to gray variety.
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