Boucheron Floral Gem Brooch with Precious Stones

Platinum, diamond and gem-set brooch, Boucheron, Paris designed…
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Platinum, diamond and gem-set brooch, Boucheron, Paris designed as a trailing floral and foliate spray, the flowerheads each centrally-set with either a circular-cut ruby, sapphire, or emerald and diamond-set flowerhead, the stems set with baguette diamonds and circular-cut sapphire bud accents, the sapphires, rubies, emeralds and diamonds together weighing approximately 2.15, 0.95, 0.60 and 1.00 carat respectively, length approximately 42 mm, signed Boucheron, Paris. Provenance: HRH Princess Zainab Hilmi, Egypt. Private collection, Melbourne, by descent from the above

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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.
  • Emeralds - Emeralds have been used in jewellery making for thousands of years, and are prized for their deep green colour, which is caused by the presence of chromium and vanadium in the mineral beryl. Because of their rare colour, emeralds are often more valuable than diamonds of a similar size and quality. In jewellery making, emeralds are typically cut into round or oval shapes to maximize their color and clarity. They are often set in gold or platinum and used as the centrepiece of a piece of jewellery, such as a ring or necklace. They can also be used in combination with other gems, such as diamonds, to create intricate and beautiful designs.
  • Foliate - Decorated with leaves or leaf-like forms.

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