- 1). Write down this conversion rate: One carat is equal to 0.007054 ounces.
- 2). Check to see how many carats your gemstone is. You can ask a jeweler or measure how many millimeters your stone is with a ruler and use a comparison chart to determine the carats.
- 3). Multiple the number of carats by 0.007054 to get the weight of your gemstone in ounces.
- 4). Divide the number of carats by 141.7476 as another way to get the weight in ounces.
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