Calibrated Size Charts for Gemstones to be set in Standard Jewelry Mountings

Oval Cut Calibrated Size Chart for Standard Jewelry Mountings (approximate weights) Size in mm Weight in carat 5x3 6x4 7x5 8x6 9x7 10x8 11x9 12x10 14x12 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) 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) Size in mm Weight in carat 5x3 6x4 7x5 8x6 9x6 10x7 12x8 14x9   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) Size in mm Weight in carat 5x3 6x4 7x5 8x6 9x7 10x8 11x9 12x10 14x12 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) Size in mm Weight in carat 4x2 5x3 6x3 7x3.5 8x4 10x5 12x6 14x7   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