Diamond and emerald brooch / pendant / clasp, Russia, circa 1900, of target design claw-set to the centre with a circular-cut emerald framed by three tiers of old mine-cut diamonds together weighing approximately 6.50 carats, diameter approximately 0.98 in., later clasp and surmount, one clasp fitting deficient, struck with maker's mark G.A., mark for Moscow, 56 standard.
- 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.
- Tier - One or more under-shelves of a table or cabinet.
- 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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