Basic features of Amethyst and Aquamarine
Amethyst is a semi-precious crystal that is often used in jewellery. It normally comes in violet color, which it gets from iron impurities and irradiation. Sometimes it comes in shades of pink, lilac and mauve. The darker the violet color, the more expensive the crystal. The best types of Amethyst stones are found in Sri Lanka, Siberia, Brazil and Far East. It is believed to have healing/mystical powers and has various other uses than just jewellery. It was once available to only the royal families but it is more widely available now. Because of its affordable price and availability, amethyst stones are now used as mass-market gems.
Color: The most costly type of amethyst is the strong reddish purple stone. Gemstone dealers prefer dark purple and saturated reddish purple amethyst. They however are not very interested in the once that are so dark that the brightness is reduced. Any color zoning or bronzed tints in the stone lowers its price value. The color of the gem can be lightened through heat treatment.
Aquamarine is a bluish green crystal used in jewellery. The color ranges from pale blue to beautiful aqua blue. It is also an affordable and easily available semi-precious gem. It usually comes from Brazil and Columbia. It belongs to the beryl crystal family. Beryl can be found abundantly in nature. When yellow or yellow orange it is called heliodor, and when bluish green it is called aquamarine. The rarest kind is the deep red beryl called bixbate. The shade of blue tint that an aquamarine stone feature comes from traces of iron in its chemical composition. It is highly resistant to damage and hence can be easily mined off a rock or mineral. The color of aquamarine stones can be lightened through heat treatment. The yellow-green and yellow-brown stone is treated with heat at 752 and 842 Fahrenheit. This process permanently lightens the gem.
Cut: Aquamarines are highly resistant to inclusion which makes it very easy for the jewellers to cut and shape the stones into various styles. The traditional cuts are pear, square and oval. Various modern and vanity shapes are also available now.