Black opal and diamond ring claw-set with a black opal…
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Black opal and diamond ring claw-set with a black opal fashioned as an oval cabochon displaying a distinct play of colour predominantly in vivid blues, greens and reddish orange, weighing approximately 2.12 carats, between spilt shoulders set with brilliant-cut diamonds together weighing approximately 0.44 carat, mounted in 18ct white gold, size O. Other Notes: Due to their scarcity, black opals are highly sought after, and are the most valued of all opal types. Nestled in Northern New South Wales, Lightning Ridge was first discovered to contain opal deposits in 1873 and mining commenced in 1901. Lightning Ridge, whence this lot originated, is one of the few places in the world where the precious and highly prized black opal is found.

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  • Carat - A carat (abbreviated "ct") is a unit of measurement used to describe the weight of a diamond or other gemstone, and separately is a unit of measurement used to describe the weight of precious metals such as gold,.

    For gemstones, one carat is equal to 0.2 grams or 200 milligrams. The weight of a diamond is one of the Four Cs (along with cut, colour, and clarity) that are used to determine a diamond's value.

    It is important to note that a diamond's weight does not necessarily correspond to its size. A diamond's cut, which affects how well it reflects light, can make a diamond of a lower weight appear larger than a diamond of a higher weight. Additionally, the carat is not the only factor to determine the value of a diamond, other factors such as clarity, colour and cut are important too.

    In the gold industry, the purity of gold is measured in carats (abbreviated "ct"), with 24 karats being pure gold and lower carat numbers indicating a lower purity level. So, for example, 18 carat gold is 18/24 or 75% pure gold, and 12 carat gold is 12/24 or 50% pure gold.
  • Claw Set Jewellery - The description "claw set" in jewellery refers to a setting where the gemstone is held in place by metal prongs that resemble claws. These prongs are bent over the edges of the gemstone to secure it in the setting. This type of setting is commonly used for diamonds and other precious stones.

  • Cabochon Cut in Jewellery - A cabochon cut is a type of gemstone cutting where the stone is cut and polished in a convex shape with a flat bottom and a domed top, with no facets. This type of cut is typically used for opaque or translucent stones that have natural patterns or inclusions that are best displayed in this type of cut. Examples of stones that are often cut as cabochons include turquoise, opal, and moonstone.

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