An Australian 'Kalgoorlie' Goldfields Miner's brooch, by George…
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An Australian 'Kalgoorlie' Goldfields Miner's brooch, by George Richard Addis, 91 Hannan Street, Kalgoorlie, Western Australia, circa 1895, designed with arched gold lettering 'KALGOORLIE' above crossed pick axe, shovel with nugget and sledgehammer supporting a central windlass suspending a bucket through a gold nugget ground, marked 'GR.ADDIS/18ct', mounted in 18 carat and pure gold. George Addis trained and worked as a jeweller in Melbourne and Launceston before opening his business in Kalgoorlie in 1895. Addis was well known for his Goldfield designed jewellery and was reputed to own the largest collection of gold nuggets in Western Australia. The collection was occasionally displayed in his shop. Other examples of Addis's 'Kalgoorlie' brooches are in the collections of the National Gallery of Victoria and National Gallery of Australia

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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.
  • 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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