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Gold's purity has been a topic of intrigue and significance for centuries. The term carrots "carat" is a critical unit of measurement for determining gold’s fineness or purity. In its purest form, gold is incredibly soft, necessitating the addition of other metals to enhance its durability. Let's delve into why gold is measured in carats and what this means for the gold we buy and cherish.

Measuring gold purity
It's important to note that "carat" (or "karat") when referring to gold purity should not be confused with the "carat" used for measuring gemstone mass. Both terms originate from the Italian word ‘caratus,’ which in turn comes from the Arabic term ‘Qīrāṭ,’ meaning “the weight of four grains”.

A single gold carat represents 1/24th part (or approximately 4.1667%) of the whole unit. This measurement standard is essential for understanding the composition of gold alloys, which are common in the market today. For example, a UK Gold Sovereign is made of 22-carat gold, which equates to 91.76% purity, with the remaining 8.33% consisting of copper. In contrast, 24-carat gold, like that found in a UK Gold Britannia, is considered pure gold. Similarly, 12-carat gold is composed of 50% gold and 50% other metals.

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Understanding gold fineness

Gold fineness is another critical aspect of measuring purity, expressed in terms of millesimal fineness (thousandth parts). The fineness of gold can range from 0.375 (9-carat) to 0.999 (24-carat). For instance, many bullion coins feature their fineness prominently in their design. The 1oz Gold Queen’s Beasts Unicorn coin, for example, has "999.9" inscribed around its edge, indicating its high purity.

While carat remains a widely used measure, fineness standards can vary by country. Bullion that is 99.95% pure or above is generally considered pure gold (24-carat). Other popular gold coins, such as the US Gold Eagles, UK Gold Sovereigns, and South African Gold Krugerrands, have a fineness of 917 (91.7% pure) and are classified as 22-carat. In India, 916 purity (91.6% gold) is the standard, also corresponding to 22-carat gold. The purest gold ever refined, known as six nines fine (999.999), was produced by The Perth Mint in 1957.

Gold weight and measurement

Modern commodities are typically measured using avoirdupois ounces (28.3495 grams). However, gold andnother precious metals are measured in troy ounces (31.1035 grams), a standard exclusively used since the 16th century. This distinction underscores the specialised nature of gold and silver trading and valuation.

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The enduring relevance of Carats

Gold has been one of the most stable and valuable commodities throughout history, and the carat system remains integral to its valuation. This unit of measurement allows for consistency and clarity in gold trading and ownership. The carat's historical significance and practical utility are testaments to its enduring relevance in the world of precious metals.

As we continue to rely on gold for investment and adornment, the carat system will undoubtedly remain a crucial part of how we understand and appreciate this timeless metal. Just as gold itself has stood the test of time, the carat is likely to remain a fundamental measure of purity for generations to come.

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