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Calibrated Size :: Calibrated Size Comparison Chart
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Calibrated Size Charts for Gemstones to be set in Standard Jewelry Mountings
Oval Cut

Calibrated Size Chart for Standard Jewelry Mountings (approximate weights)
Oval Gemstones
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
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)
Round Gemstones
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
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)
Pear Gemstones
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  
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)
Octagon Gemstones
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
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)
Marquise Gemstones
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  
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  
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