Carat (ct)
Definition: The carat (ct) is a unit of mass used for measuring gemstones and pearls. One carat is precisely 200 milligrams (0.2 grams). It ensures standardization in the valuation of diamonds, sapphires, and other precious stones.
History: The carat originates from the seeds of the carob tree, which were historically used as counterweights due to their uniform mass. The modern metric carat (200 mg) was standardized in 1907 to eliminate regional inconsistencies. This change facilitated international trade and valuation of gemstones.
Current Use: The carat is universally used in the jewelry and gemstone industries. It provides an accurate measurement for diamonds, emeralds, and other precious stones, ensuring fair pricing in global markets.
Stone (st)
Definition: The stone (st) is a British unit of mass equivalent to 14 pounds, or approximately 6.35 kilograms. It is mainly used in the UK and Ireland for measuring body weight and, historically, agricultural produce and trade goods.
History: The stone has been used in Europe for centuries, with varying values depending on the region and commodity measured. The British stone was standardized at 14 pounds in 1835 under the Weights and Measures Act, primarily for weighing people and livestock. While largely replaced by metric units, it remains popular in sports and healthcare.
Current Use: The stone is still used in the UK and Ireland to express body weight, especially in medical and fitness contexts. It is less common in trade but occasionally used for measuring wool and agricultural products.
Quick Conversion Table Carat (ct) to Stone (st)
1 Carat (ct) equal to 0.000031495 Stone (st)
5 Carat (ct) equal to 0.000157473 Stone (st)
10 Carat (ct) equal to 0.000314946 Stone (st)
20 Carat (ct) equal to 0.000629892 Stone (st)
30 Carat (ct) equal to 0.000944838 Stone (st)
50 Carat (ct) equal to 0.00157473 Stone (st)
75 Carat (ct) equal to 0.002362096 Stone (st)
100 Carat (ct) equal to 0.003149461 Stone (st)