18ct bi-colour gold, sapphire and diamond ring, of cluster…
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18ct bi-colour gold, sapphire and diamond ring, of cluster design, centring a cushion-shaped sapphire weighing 9.12 carats bezel-set in 18ct yellow gold and framed by a border pave-set with brilliant-cut diamonds to split shoulders partially pave-set with brilliant-cut diamonds, the diamonds together weighing approximately 1.63 carats, size O 1/2. Accompanied by an Aigs Gemstone Identification Report numbered GF19043088, dated 29 April 2019, stating that the 9.12 carat sapphire is natural, with indications of heating, of Sri Lankan origin.

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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.

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