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Used in jewellery to describe a rectangular-cut gemstone.
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Balance
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A wheel-like element in a watch which alternately rotates clockwise and counter-clockwise. It is connected to the gear train of a watch and designed to make the movement of the gear train as uniform as possible. Also called balance-wheel.
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Barrel
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Thin cylindrical box containing the mainspring of a watch. The toothed rim of the barrel drives the train.
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Bezel
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The retaining ring in which the watch’s crystal or glass is mounted. It forms part of the case and was usually hinged to the main body until about 1880, after which screw-threaded or snap-on bezels gradually came into use.
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Brilliant cut
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A type of diamond cut, typically round with 58 faces.
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Brooch
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Also called a pin, an ornament that can be pinned to a garment.
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