Calibrated Size Charts for Gemstones to be set in Standard Jewelry Mountings
 Oval Cut
Calibrated Size Chart for Standard Jewelry Mountings (approximate weights) |
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| Size in mm Weight in carat |
5×3 | 6×4 | 7×5 | 8×6 | 9×7 | 10×8 | 11×9 | 12×10 | 14×12 |
| Alexandrite | .30 | .51 | .80 | 1.45 | 2.00 | 3.60 | 4.25 | 6.00 | 8.90 |
| Amethyst | .23 | .45 | .85 | 1.25 | 1.75 | 2.40 | 3.20 | 4.50 | 6.50 |
| Aquamarine | .20 | .40 | .75 | 1.10 | 1.75 | 2.25 | 3.00 | 4.50 | 6.75 |
| Citrine | .23 | .45 | .85 | 1.25 | 1.75 | 2.40 | 3.25 | 4.20 | 5.20 |
| Diamond | .25 | .50 | .75 | 1.40 | 2.00 | 3.00 | 4.00 | 5.00 | 8.00 |
| Emerald | .25 | .52 | .85 | 1.26 | 1.90 | 2.60 | 3.75 | 5.00 | 7.50 |
| Pyrope Garnet | .25 | .55 | 1.00 | 1.40 | 2.10 | 2.80 | 3.75 | 5.00 | 7.00 |
| Iolite | .21 | .40 | .63 | 1.02 | – | – | – | – | – |
| Opal | .16 | .28 | .47 | .78 | 1.10 | 1.65 | 2.15 | 3.00 | 4.00 |
| Peridot | .28 | .50 | .95 | 1.35 | 2.00 | 2.50 | 3.50 | 4.00 | 6.00 |
| Ruby | .35 | .60 | 1.06 | 1.55 | 2.20 | 3.15 | 3.80 | 6.00 | 7.25 |
| Sapphire | .35 | .60 | 1.00 | 1.55 | 2.20 | 3.15 | 3.80 | 6.00 | 7.25 |
| Tanzanite | .20 | .48 | .89 | 1.35 | – | – | – | – | – |
| Topaz | .28 | .57 | 1.10 | 1.60 | 2.50 | 3.50 | 4.50 | 6.00 | 8.80 |
| Tourmaline | .25 | .50 | .90 | 1.18 | 2.30 | 2.90 | 3.50 | 5.25 | 6.80 |
| Tsavorite | .28 | .52 | .75 | – | – | – | – | – | – |
| Zircon | .40 | .75 | 1.45 | 2.00 | 2.85 | 4.00 | 5.60 | 7.50 | 8.20 |
 Round Cut
Calibrated Size Chart for Standard Jewelry Mountings (approximate weights) |
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| Size in mm Weight in carat |
2 | 3 | 4 | 5 | 6 | 6.5 | 7 | 8 | 10 |
| Alexandrite | .04 | .12 | .35 | .63 | 1.30 | 1.86 | 2.15 | 2.90 | 5.20 |
| Amethyst | .04 | .10 | .20 | .40 | .70 | 1.10 | 1.30 | 1.80 | 3.30 |
| Aquamarine | .04 | .10 | .25 | .45 | .75 | 1.31 | 1.60 | 2.40 | 3.50 |
| Citrine | .04 | .10 | .20 | .40 | .70 | 1.10 | 1.30 | 1.80 | 3.30 |
| Diamond | .03 | .10 | .23 | .47 | .80 | 1.00 | 1.25 | 1.90 | 3.50 |
| Emerald | .04 | .12 | .27 | .48 | .80 | 1.26 | 1.70 | 2.50 | 6.10 |
| Pyrope Garnet | .05 | .13 | .30 | .60 | 1.00 | 1.40 | 1.60 | 2.50 | 5.75 |
| Opal | .02 | .09 | .16 | .34 | .57 | .75 | .83 | 1.30 | 2.00 |
| Peridot | .05 | .12 | .26 | .50 | .85 | 1.11 | 1.25 | 2.00 | 5.25 |
| Ruby | .05 | .15 | .34 | .65 | 1.05 | 1.41 | 1.60 | 2.25 | 4.50 |
| Sapphire | .05 | .15 | .34 | .65 | 1.05 | 1.41 | 1.60 | 2.25 | 4.50 |
| Topaz | .04 | .11 | .30 | .56 | 1.00 | 1.36 | 1.55 | 2.50 | 5.75 |
| Tourmaline | .04 | .12 | .24 | .45 | .75 | 1.28 | 1.55 | 2.00 | 3.00 |
| Zircon | .06 | .17 | .36 | .69 | 1.25 | 1.58 | 1.75 | 2.60 | 5.00 |
 Pear Cut
Calibrated Size Chart for Standard Jewelry Mountings (approximate weights) |
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| Size in mm Weight in carat |
5×3 | 6×4 | 7×5 | 8×6 | 9×6 | 10×7 | 12×8 | 14×9 | |
| Alexandrite | .30 | .50 | .85 | 1.10 | 2.10 | 3.60 | 6.60 | 8.80 | |
| Amethyst | .20 | .35 | .65 | .85 | 1.25 | 1.70 | 4.00 | 5.00 | |
| Aquamarine | .20 | .35 | .65 | .90 | 1.30 | 1.85 | 4.20 | 5.60 | |
| Citrine | .20 | .35 | .65 | .85 | 1.30 | 1.70 | 4.00 | 5.00 | |
| Diamond | .25 | .50 | .75 | 1.00 | 1.50 | 2.00 | 3.50 | 5.00 | |
| Emerald | .25 | .45 | .70 | 1.05 | 1.70 | 2.60 | 4.15 | 6.10 | |
| Pyrope Garnet | .25 | .40 | 1.00 | 1.15 | 1.30 | 1.80 | 3.50 | 5.80 | |
| Opal | .13 | .22 | .35 | .50 | .70 | 1.03 | 1.40 | 2.45 | |
| Peridot | .25 | .45 | .70 | .80 | 1.10 | 1.40 | 3.40 | 4.75 | |
| Ruby | .30 | .50 | .75 | 1.00 | 1.85 | 2.50 | 4.75 | 7.90 | |
| Sapphire | .30 | .50 | .75 | 1.00 | 1.85 | 2.50 | 4.75 | 7.90 | |
| Topaz | .25 | .50 | 1.00 | 1.10 | 2.00 | 3.50 | 6.50 | 8.50 | |
| Tourmaline | .35 | .45 | .60 | .90 | 1.10 | 1.40 | 2.80 | 6.75 | |
| Zircon | .30 | .70 | 1.00 | 1.30 | 2.60 | 4.00 | 5.25 | 7.50 | |
 Octagon / Emerald Cut
Calibrated Size Chart for Standard Jewelry Mountings (approximate weights) |
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| Size in mm Weight in carat |
5×3 | 6×4 | 7×5 | 8×6 | 9×7 | 10×8 | 11×9 | 12×10 | 14×12 |
| Alexandrite | .40 | .70 | 1.30 | 2.60 | 3.60 | 4.20 | 6.00 | 8.50 | 9.90 |
| Amethyst | .35 | .55 | 1.10 | 1.60 | 2.25 | 2.90 | 4.20 | 5.60 | 7.25 |
| Aquamarine | .25 | .50 | .80 | 1.40 | 2.00 | 3.00 | 4.30 | 4.75 | 7.75 |
| Citrine | .35 | .55 | 1.00 | 1.60 | 2.25 | 2.90 | 4.20 | 5.60 | 7.25 |
| Diamond | .25 | .50 | 1.00 | 1.50 | 3.00 | 4.00 | 5.00 | 7.80 | 8.80 |
| Emerald | .30 | .60 | .90 | 1.80 | 2.31 | 3.15 | 4.50 | 5.25 | 5.80 |
| Pyrope Garnet | .40 | .80 | 1.20 | 1.70 | 2.50 | 3.50 | 4.30 | 6.35 | 9.00 |
| Peridot | .35 | .60 | 1.00 | 1.70 | 2.25 | 3.80 | 5.25 | 6.25 | 8.80 |
| Ruby | .55 | .75 | 1.15 | 1.60 | 2.30 | 2.75 | 4.00 | 6.25 | 9.00 |
| Sapphire | .55 | .75 | 1.15 | 1.75 | 2.30 | 2.75 | 4.00 | 6.25 | 9.00 |
| Topaz | .40 | .65 | 1.25 | 2.40 | 3.40 | 4.00 | 5.75 | 8.00 | 9.50 |
| Tourmaline | .30 | .60 | 1.60 | 2.15 | 2.80 | 3.60 | 4.30 | 5.20 | 8.50 |
| Zircon | .60 | .85 | 1.70 | 2.35 | 3.90 | 450 | 6.20 | 7.01 | 8.95 |
 Marquise Cut
Calibrated Size Chart for Standard Jewelry Mountings (approximate weights) |
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| Size in mm Weight in carat |
4×2 | 5×3 | 6×3 | 7×3.5 | 8×4 | 10×5 | 12×6 | 14×7 | |
| Alexandrite | .07 | .20 | .30 | .50 | .70 | 1.25 | 2.10 | 3.50 | |
| Amethyst | .10 | .15 | .20 | .34 | .48 | .90 | 1.59 | 2.45 | |
| Aquamarine | .08 | .14 | .20 | .25 | .50 | .80 | 1.50 | 2.75 | |
| Citrine | .10 | .15 | .20 | .35 | .50 | .90 | 1.59 | 2.45 | |
| Diamond | .12 | .18 | .25 | .37 | .50 | 1.00 | 2.00 | 3.00 | |
| Emerald | .09 | .19 | .30 | .45 | .60 | 1.40 | 1.80 | 2.80 | |
| Pyrope Garnet | .09 | .16 | .25 | .42 | .60 | 1.20 | 2.00 | 2.85 | |
| Opal | .09 | .13 | .17 | .27 | .37 | .59 | 1.00 | 1.25 | |
| Peridot | .10 | .17 | .25 | .37 | .50 | 1.00 | 2.00 | 2.55 | |
| Ruby | .13 | .24 | .35 | .55 | .75 | 1.15 | 2.20 | 3.00 | |
| Sapphire | .13 | .24 | .35 | .55 | .75 | 1.15 | 2.20 | 3.00 | |
| Topaz | .07 | .17 | .30 | .50 | .70 | 1.20 | 2.00 | 3.40 | |
| Tourmaline | .10 | .20 | .30 | .45 | .60 | .85 | 1.55 | 2.20 | |
| Zircon | .13 | .23 | .33 | .55 | .75 | 1.25 | 1.95 | 3.00 | |
