Troy Ounces
A unit of apothecary weight equal to 480 grains or one twelfth of a troy pound
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A unit of apothecary weight equal to 480 grains or one twelfth of a troy pound
Abbreviated "ct." and spelled with a "c" is a measure of weight used for gemstones. One carat is equal to 1/5 of a gram (200 milligrams). Stones are measured to the nearest hundredth of a carat. A hundreth of a carat is also called a point. Thus a .10 carat stone can be called either 10 points, or 1/10 of a carat. Small stones like .05, and .10ct are most often referred to by point designations. Note that karat with a "K" is a measure of the purity of a gold alloy. A one carat round diamond of average proportions is approximately 6.5mm in diameter. Note that this relationship of weight and size is different for each family of stones. For example ruby and sapphire are both heavier than diamond (technically, they have a higher specific gravity, so a 1 carat ruby or sapphire is smaller in size than a on carat diamond. See Weights and Measures of Gold, Silver and Precious Gems for more information.
Troy Ounces | Carats |
---|---|
0t oz | 0.00ct |
1t oz | 155.52ct |
2t oz | 311.03ct |
3t oz | 466.55ct |
4t oz | 622.07ct |
5t oz | 777.59ct |
6t oz | 933.10ct |
7t oz | 1088.62ct |
8t oz | 1244.14ct |
9t oz | 1399.66ct |
10t oz | 1555.17ct |
11t oz | 1710.69ct |
12t oz | 1866.21ct |
13t oz | 2021.73ct |
14t oz | 2177.24ct |
15t oz | 2332.76ct |
16t oz | 2488.28ct |
17t oz | 2643.80ct |
18t oz | 2799.31ct |
19t oz | 2954.83ct |
Troy Ounces | Carats |
---|---|
20t oz | 3110.35ct |
21t oz | 3265.87ct |
22t oz | 3421.38ct |
23t oz | 3576.90ct |
24t oz | 3732.42ct |
25t oz | 3887.93ct |
26t oz | 4043.45ct |
27t oz | 4198.97ct |
28t oz | 4354.49ct |
29t oz | 4510.00ct |
30t oz | 4665.52ct |
31t oz | 4821.04ct |
32t oz | 4976.56ct |
33t oz | 5132.07ct |
34t oz | 5287.59ct |
35t oz | 5443.11ct |
36t oz | 5598.63ct |
37t oz | 5754.14ct |
38t oz | 5909.66ct |
39t oz | 6065.18ct |
Troy Ounces | Carats |
---|---|
40t oz | 6220.70ct |
41t oz | 6376.21ct |
42t oz | 6531.73ct |
43t oz | 6687.25ct |
44t oz | 6842.76ct |
45t oz | 6998.28ct |
46t oz | 7153.80ct |
47t oz | 7309.32ct |
48t oz | 7464.83ct |
49t oz | 7620.35ct |
50t oz | 7775.87ct |
51t oz | 7931.39ct |
52t oz | 8086.90ct |
53t oz | 8242.42ct |
54t oz | 8397.94ct |
55t oz | 8553.46ct |
56t oz | 8708.97ct |
57t oz | 8864.49ct |
58t oz | 9020.01ct |
59t oz | 9175.53ct |