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Coins come in various weights and shapes (really). Fortunately, the coins we sell are all round! But they do come in various sizes. The following table may be useful for you in understanding all of the metric sizes, weights, and purities (for Silver and Gold coins) that are used on our website:
| Metric Equivalent | Common Measurement |
| 28.34953 Grams | 1 Ounce |
| 31.10348 Grams | 1 Troy Ounce |
| 373.2418 Grams | 1 Troy Pound |
| 453.593 Grams | 1 Pound |
| 28.60 Millimeters | approx. 1 1/8 Inches |
| 41 Millimeters | 1.6142 inches |
| .925 Fine | 92.5 % pure / 7.5% other metals |
| .999 Fine | 99.9% pure / 0.1% other metals |
Troy measurements are also known as Apothecary measurements. There are 12 Troy Ounces in 1 Troy Pound. The other common measurement system is called Avoirdupois. There are 16 Ounces to 1 Pound in the Avoirdupois system.
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