Quartz with Inclusions - Diamonds, Gems

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Some fine gems still adorn the British Crown Jewels. Massive chunks of amethyst, usually banded with white quartz, are carved into decorative objects and goblets. So-called "Siberian amethyst" once -ed to Russian material, but it is a term now generally synonymous w a particularly fine color grade.The hardness of quartz is 7 on the Mohs scale, so the material is hard high for use in all types of jewelry.

The mineral is fairly tough and has cleavage, so gems wear well in rings. Most quartz gems are inexpen¬sive especially the colorless and rose and other pale colors. Citrines . command prices of several dollars per carat, and amethysts of large - and fine color may well cost several tens of dollars per carat.

Quartz with Inclusions

Many popular gems are quartz varieties containing various inclusions. these inclusions are actually minerals that formed along with the or else were present beforehand and became trapped inside the quartz crystals that grew around them. The list of observed inclusions in quartz includes dozens of mineral species, but only, a few of them characterize material of gem significance.

Quartz Gems

Much of the golden-colored or brownishquartz being sold today as "topaz" is actually heat-treated amethyst. Lighter-colored stones are sold as "Palmyra topaz" and deeper, reddish-brown gems as "Madeira topaz," both of which are misnomers.

Rose quartz occurs in a delicate pink color. The material is - completely transparent, but rather tends to be some what cloudy. the color ranges from nearly white to a deep rose-pink. Rose quartz common than other color varieties, and occurs chiefly in the cores of pegmatites. Occasionally inclusions of rutile are dense enough to create a weak star. The finest rose quartz comes from Brazil, the Malagasay Republic, Maine, and the U.S.S.R.

Green quartz is quite rare, but in the early 1950's it was discover( certain amethysts, when heated, would turn a lovely green color gems are met occasionally in the gem trade, sometimes marketed as prasiolite.

Amethyst is the most highly prized quartz variety. Its color range pale lilac (almost colorless) to a deep, rich, royal purple, some times ¬showing reddish highlights. The growth of amethyst crystals is generally marked by changes in the composition of the growth solutions, leading to color zoning or banding in the crystals. Most cut amethysts display Such banding, but the gem has to be turned in just the right position for this be seen. The name "amethyst" comes from the Greek "amethustos,”meaning "not drunken." In ancient times it was believed that amethyst wearer could never become intoxicated.

The gem was highly prized. and was used in both the breastplate of the High Priest of Israel we foundation walls of the New Jerusalem. Amethyst has long been popular in ecclesiastical jewelry. Catherine the Grate’s love of amethyst ed develop sources in the U.S.S.R. and enriched the Russian Treasury.


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