Calibrated Size Charts for Gemstones to be set in Standard Jewelry Mountings
The weights listed on this page are in carats.
 Oval Cut
Calibrated Size Chart for Standard Jewelry Mountings (approximate weights) |
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Size in mm
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| 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
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| 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
|
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| 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
|
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| 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
|
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| 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 | |