Round Cut Gemstones Size Chart

Round Gemstones is also referred as Round 'Brilliant', 'American Ideal' or 'American Standard'. The standard facet of round cut is 57. It provides the maximum optics for brilliance and scintillation, making it to sparkle and dance in the light. Making Round cut gemstone is a long process where it required the cutter to work with unique rough stones. Use Round Cut Gemstones Size Chart to find the conversion of mm to carat weight of different sizes.

Round Gemstones mm to Carat Weight Conversion

Round Faceted Gemstone Weight Chart (approximate weights)
2mm 3mm 4mm 5mm 6mm 6.5mm 7mm 8mm 10mm
Alexandrite .04 ct .12 ct .35 ct .63 ct 1.30 ct 1.86 ct 2.15 ct 2.90 ct 5.20 ct
Amethyst .04 ct .10 ct .20 ct .40 ct .70 ct 1.10 ct 1.30 ct 1.80 ct 3.30 ct
Aquamarine .04 ct .10 ct .25 ct .45 ct .75 ct 1.31 ct 1.60 ct 2.40 ct 3.50 ct
Citrine .04 ct .10 ct .20 ct .40 ct .70 ct 1.10 ct 1.30 ct 1.80 ct 3.30 ct
Emerald .04 ct .12 ct .27 ct .48 ct .80 ct 1.26 ct 1.70 ct 2.50 ct 6.10 ct
Garnet .05 ct .13 ct .30 ct .60 ct 1.00 ct 1.40 ct 1.60 ct 2.50 ct 5.75 ct
Opal .02 ct .09 ct .16 ct .34 ct .57 ct .75 ct .83 ct 1.30 ct 2.00 ct
Peridot .05 ct .12 ct .26 ct .50 ct .85 ct 1.11 ct 1.25 ct 2.00 ct 5.25 ct
Ruby .05 ct .15 ct .34 ct .65 ct 1.05 ct 1.41 ct 1.60 ct 2.25 ct 4.50 ct
Sapphire .05 ct .15 ct .34 ct .65 ct 1.05 ct 1.41 ct 1.60 ct 2.25 ct 4.50 ct
Topaz .04 ct .11 ct .30 ct .56 ct 1.00 ct 1.36 ct 1.55 ct 2.50 ct 5.75 ct
Tourmaline .04 ct .12 ct .24 ct .45 ct .75 ct 1.28 ct 1.55 ct 2.00 ct 3.00 ct
Zircon .06 ct .17 ct .36 ct .69 ct 1.25 ct 1.58 ct 1.75 ct 2.60 ct 5.00 ct

There are many people involved in the creation of round cut gemstone, but the main credit goes to Vincenzio Perruzzi, who belongs to 18th century. Making Round cut gemstone is a long process where it required the cutter to work with unique rough stones. Round cut gemstone size in millimeter get varies according to the stone weight in carat.


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