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Chalcedony's standard chemical structure (based on the chemical structure of quartz) is SiO 2 (silicon dioxide). Chalcedony has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black.
Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...
Another vintage jewelry piece that could be worth a lot is the French Haute Couture Honeycomb from the 1950s. ... “A typical piece from this era, such as a lace-like diamond necklace, can be ...
The largest ever single order to Cartier was made in 1925 by the Indian royalty, the Maharaja of Patiala, for the Patiala Necklace and other jewellery worth ₹ 1,000 million (equivalent to ₹ 210 billion, US$2.5 billion or €2.4 billion in 2023).
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Jade bird pendant from Costa Rica. Jadeite is presumed one of the most precious materials of Pre-Columbian Costa Rica. It, along with other similar-looking greenstones (e.g. chalcedony, serpentine, and green jasper) were cherished and worked for years. Jadeite was used to decorate the body and was presumably a symbol of power.