A diamond and gem-set 'Allegra' necklace, by Bulgari, of…
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A diamond and gem-set 'Allegra' necklace, by Bulgari, of flexible design, composed of four rows of round cultured pearls, measuring approximately 7.00 mm each, alternately set with vari-cut multi-coloured gemstones including blue topaz, amethyst, peridot, citrine, and pink and green tourmaline, between pave-set round brilliant-cut diamond bar link spacers, signed Bulgari, diamonds approximately 8.00 carats total, mounted in 18 carat yellow gold, Italian assay marks, with maker's case and certificate, inner circumference 34.0 cm, adjustable

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  • Assay / Assayed - Assaying is the testing of a metal, most commonly silver and gold to determine its ingredients and quality. In Britain, once an item of silver or gold has been assayed, a mark is stamped on it, certifying its purity. Known as hallmark, it derives its name from the Guild Hall of the Goldsmiths' Company, who recieved its Charter in 1327 giving it the power to assay and mark articles of gold and silver.
  • 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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