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The word prasiolite literally means "scallion green-colored stone" and is derived from Greek πράσον prason meaning "leek" and λίθος lithos meaning "stone". The mineral was given its name due to its green-colored appearance. Natural prasiolite is a very light, translucent green. Darker green quartz is generally the result of ...
A lapidary is a text in verse or prose, often a whole book, that describes the physical properties and metaphysical virtues of precious and semi-precious stones, that is to say, a work on gemology. [1] It was frequently used as a medical textbook, since it also includes practical information about the supposed medical application of each stone ...
Peridot is one of the few gemstones that occur in only one color: an olive-green. The intensity and tint of the green, however, depends on the percentage of iron in the crystal structure, so the color of individual peridot gems can vary from yellow, to olive, to brownish-green. In rare cases, peridot may have a medium-dark toned, pure green ...
Ancient Egyptians mined for crystals and used them to make jewelry. Crystals or gemstones were also used in practice, for their metaphysical properties. Specifically, they used crystals as aids for health and protection.
The carbuncle was the first stone of the second row of the priestly breastplate and it represented Judah, and is also the eighth stone mentioned of the riches of the King of Tyre (Ezekiel 28:13). An imported object, not a native product, (Ezekiel 28:16); it is the third stone of the foundation of the celestial Jerusalem (Revelations 21:19).
It is best used in earrings, pendants, brooches, and other types of jewelry where it will not encounter impact or abrasion. Even in these uses it should be considered to be a very delicate stone. If it is used as a ring stone, the facet edges will be easily abraded, the faces will be easily scratched, and the stone might be chipped with even a ...
GIA also designs and manufactures professional equipment for grading, identifying, and selling diamonds and colored gemstones. These instruments are used to determine the physical and optical properties of gems and analyze their microscopic features. The first GIA instrument, a 10x eye loupe, was introduced in the early 1930s.
A stone is ground into shape (often a cabochon or a short, wide cylinder) and polished to a shine. Sometimes the flat surface is engraved with a religious motto in Arabic, which is sometimes inlaid with gold. The finished gem is then mounted on a ring according to the stones finished size.
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