A retro suite of sapphire and yellow sapphire jewellery, circa…
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A retro suite of sapphire and yellow sapphire jewellery, circa 1940, French, each earclip designed as a flowerhead, the square and circular-shaped blue sapphire centres to the oval and cushion-shaped yellow sapphire petals, together with a clip brooch, designed as a sapphire and yellow sapphire flowerhead issuing gold wirework foliate detail, maker's mark Sas, indistinct, yellows sapphires approximately 35.00 carats total, blue sapphires approximately 8.60 carats total, mounted in 18 carat yellow gold, French assay marks, earring width 2.2 cm, brooch length 4.1 cm . Accompanied by a report from the Gem Studies Laboratory (Gsl), Australia, stating that the tested yellow sapphire weighing 2.40 carats is natural, of Ceylon (Sri Lankan origin), with no evidence of heat treatment. Report number AA53896, dated 3 October 2014

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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.
  • Foliate - Decorated with leaves or leaf-like forms.
  • Circa - A Latin term meaning 'about', often used in the antique trade to give an approximate date for the piece, usually considered to be five years on either side of the circa year. Thus, circa 1900 means the piece was made about 1900, probably between 1895 and 1905. The expression is sometimes abbreviated to c.1900.

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