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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 ...
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 ...
This page was last edited on 25 December 2024, at 14:17 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Prasiolite, an olive colored material, is produced by heat treatment; [68] natural prasiolite has also been observed in Lower Silesia in Poland. [69] Although citrine occurs naturally, the majority is the result of heat-treating amethyst or smoky quartz. [68] Carnelian has been heat-treated to deepen its color since prehistoric times. [70]
Example of bead set diamonds Example of pavé set diamonds "Bead setting" is a generic term for setting a stone directly into metal using gravers, also called burins, which are essentially tiny chisels. A hole is drilled directly into the surface of the metal, before a ball burr is used to make a concave depression the size of the stone.
Once the discovery of gemstones and gem cutting became more readily available, the art of jewellery ornamentation and design shifted. The earliest documented gemstone cut was done by Theophilus Presbyter (c. 1070–1125), who practised and developed many applied arts and was a known goldsmith.
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