Cushion Sapphire and Diamond Ring, 18K White Gold

A sapphire and diamond ring, centring a cushion-shaped sapphire,…
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A sapphire and diamond ring, centring a cushion-shaped sapphire, weighing 16.26 carats, mounted within a millegrain round brilliant-cut diamond surround, with similarly-set shoulders, diamonds approximately 1.80 carats total, mounted in 18 carat white gold, ring size O . Accompanied by a report from the Gem Studies Laboratory (GSL), Australia, stating that the sapphire is of Ceylon (Sri Lankan) origin, with no evidence of heat treatment. Report number AA53801/1, dated 10 September 2014

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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.
  • Millegrain - A type of jewellery setting where the stone is held is held in position by small adjacent beads of metal. This method of securing the stone was popular in the 19th century.

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