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Main jade producing countries. Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments.Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals). [1]
Jade is most commonly associated with the colour green but can come in several other colours as well. Jade is closely linked to Asian culture, history, and tradition, and is sometimes referred to as the stone of heaven. Jasper Jasper is a gemstone of the chalcedony family that comes in a variety of colours.
The relic of the Virgin Mary's wedding ring, which according to different accounts had an onyx, amethyst, or green jasper, was supposedly brought back from the Holy Land in 996 CE. It was placed in the Church of Santa Mustiola , Clusium (modern Chiusi ), Italy, and in 1473 the ring was transferred to the Franciscan monastery in that city.
Although the term jasper is now restricted to opaque quartz, the ancient iaspis was a stone of considerable translucency including nephrite. [2] The jasper of antiquity was in many cases distinctly green, for it is often compared to emerald and other green objects. Jasper is referred to in the Nibelungenlied as being clear and
Mughal dagger hilt in jade with gold, rubies, and emeralds.. Hardstone carving, in art history and archaeology, is the artistic carving of semi-precious stones (and sometimes gemstones), such as jade, rock crystal (clear quartz), agate, onyx, jasper, serpentinite, or carnelian, and for objects made in this way.
A beautiful jade ring was valued at an even prettier price on Monday night's episode of "Antiques Roadshow." "You're looking at an auction valuation of $60,000 to $80,000," said appraiser Gloria ...
Its color is normally apple-green, but varies from turquoise-like cyan to deep green. The darker varieties of chrysoprase are also referred to as prase . (However, the term prase is also used to describe chlorite -included quartz, and to a certain extent is a color-descriptor, rather than a rigorously defined mineral variety.)
Green jasper, with Cretan hieroglyphs, 1800 BC. Later, some are extremely fine engraved gems; other seals are in gold, usually on signet rings. [7] The subjects shown cover the full range of Minoan art. The so-called Theseus Ring was found in Athens; it is gold, with a bull-leaping scene in intaglio on the flat bezel. [8]