# Troy Ounces to Carats (oz t to ct) Source: https://www.unitconvertercalculator.com/weight/troy-ounces-to-carats/ **1 oz t = 155.517384 ct** One troy ounce equals approximately 155.5 carats. Both units measure precious materials: the troy ounce prices gold and silver at exchanges, while the carat measures gemstones at jewelers. A one-troy-ounce gold coin contains about 155 carats of gold, and a 155-carat diamond would weigh one troy ounce. ## Formula Apply the conversion factor ## Conversion Table | Troy Ounces (oz t) | Carats (ct) | |---|---| | 0.1 oz t | 15.5517384 ct | | 0.25 oz t | 38.879346 ct | | 0.5 oz t | 77.758692 ct | | 1 oz t | 155.517384 ct | | 2 oz t | 311.034768 ct | | 5 oz t | 777.58692 ct | | 10 oz t | 1555.17384 ct | | 25 oz t | 3887.9346 ct | | 50 oz t | 7775.8692 ct | | 100 oz t | 15551.7384 ct | | 250 oz t | 38879.346 ct | | 500 oz t | 77758.692 ct | | 1000 oz t | 155517.384 ct | ## Units ### Troy Ounce (oz t) A troy ounce is a unit of mass used for precious metals such as gold, silver, and platinum. It equals exactly 31.1034768 grams, about 10% heavier than the common avoirdupois ounce. ### Carat (ct) A carat is a unit of mass equal to exactly 200 milligrams (0.2 grams), used for measuring gemstones and pearls. Adopted internationally in 1907 by the Fourth General Conference on Weights and Measures. ## Background Luxury jewelry combining gold and gemstones requires both units. A gold ring weighing 0.2 troy ounces (about 6.2 grams) may be set with a 1-carat diamond, and jewelers must track both metals (in troy ounces) and stones (in carats) in their inventory. ## Good to Know The troy ounce and carat are the two pillars of the luxury goods measurement system. Gold is priced per troy ounce; diamonds are priced per carat. A single piece of fine jewelry may involve both units simultaneously, with the gold band measured in fractions of troy ounces and the gemstone measured in carats. The factor of 155.5 connects these two units at the jeweler's workbench. ## FAQ ### How many carats are in one troy ounce? One troy ounce equals approximately 155.517 carats. This is 31.1035 grams divided by 0.2 grams per carat. ### How do I convert troy ounces to carats? Multiply troy ounces by 155.5. For example, 0.5 troy ounces equals about 77.8 carats. ### When is this conversion used? In the jewelry industry, where precious metals are tracked in troy ounces and gemstones in carats. Jewelers need both units for inventory management and pricing. ## Non-Frequently Asked Questions ### Which is worth more: a troy ounce of gold or 155 carats of diamond? A troy ounce of gold is worth roughly $2,200. 155 carats of gem-quality diamonds could be worth anywhere from $155,000 to over $15 million depending on quality. Diamond beats gold by at least 70 to 1 in value per unit weight, which is why engagement rings use diamond for the impressive stone and gold merely for the band. ### Has anyone ever owned a 155-carat diamond? Several diamonds exceed 155 carats. The Hope Diamond is 45.52 carats; the Cullinan I (Great Star of Africa) is 530 carats. A 155-carat diamond would be extraordinarily valuable and famous, worth somewhere between $20 million and $200 million depending on clarity and color. ### If I melt a gold coin and pour it into a diamond mold, do I get 155 carats of gold? You get one troy ounce (155.5 carats) of gold in whatever shape your mold provides. Gold is too soft and dense to make a convincing diamond imitation regardless of shape. 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