This is a very nice heavy 15 carat gold bar brooch of good quality, the central lozenge set with seed pearls and an emerald.
15 carat gold is gold of 625 parts of pure gold per 1000. It was only a legal standard of gold in British jewellery between 1854 and 1931.  This standard was replaced by 14 carat in 1932.  This means that any piece of antique gold jewellery from Britain with the 15 carat hallmark dates somewhere between 1854 and 1931 and you have a genuine piece of antique or vintage jewellery.
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Can be collected from My Mother's during Old Petrie Town's sunday morning market just north of Brisbane.