Approx: Gemstone Weights

Approx: Carat Weight of Gemstones

Round Shape
2mm 2.5mm 3mm 3.5mm 4mm 5mm 6mm 7mm 8mm 9mm 10mm
Quartz 0.03 0.05 0.10 0.15 0.24 0.40 0.70 1.10 1.80 2.55 3.30
Aquamarine 0.03 0.05 0.08 0.15 0.22 0.40 0.75 1.20 2.20 2.75 3.50
Emerald 0.03 0.06 0.10 0.17 0.26 0.52 0.95 1.50 2.20 2.95 3.75
Diamond 0.04 0.07 0.10 0.17 0.23 0.50 0.90 1.40 1.90 3.05 4.25
Garnet 0.04 0.07 0.11 0.23 0.31 0.56 1.00 1.60 2.20 2.75 4.15
Opal 0.02 0.04 0.06 0.11 0.16 0.34 0.57 0.83 1.40 1.95 2.55
Peridot 0.03 0.05 0.11 0.15 0.30 0.53 0.85 1.20 2.00 2.39 4.38
Ruby/Sapphire 0.05 0.09 0.14 0.22 0.38 0.65 1.20 1.80 2.40 3.45 4.50
Topaz 0.04 0.09 0.11 0.20 0.34 0.56 1.00 1.50 2.20 3.30 4.40
Tourmaline 0.04 0.08 0.12 0.17 0.25 0.45 0.80 1.30 2.00 2.60 3.35
Zircon 0.06 0.10 0.16 0.26 0.40 0.69 1.40 2.00 2.80 3.60 4.80
Oval Shape
4x3mm 5x3mm 5x4mm 6x4mm 7x5mm 8x6mm 9x7mm 10x8mm 11x9mm 12x10mm 14x10mm 16x12mm 18x13mm
Quartz 0.15 0.21 0.33 0.45 0.76 1.10 1.60 2.40 3.20 4.10 6.20 11.00 14.00
Aquamarine 0.16 0.22 0.34 0.42 0.61 1.00 1.50 2.30 3.00 4.00 6.10 10.70 13.60
Emerald 0.17 0.25 0.35 0.47 0.75 1.10 1.65 2.40 3.50 4.50 7.50    
Diamond 0.17 0.25 0.37 0.50 0.75 1.40 2.00 3.00 4.00 5.00 8.00    
Garnet 0.22 0.27 0.40 0.55 1.00 1.40 2.10 2.80 3.70 5.00 7.10 12.00 15.20
Opal 0.10 0.16 0.22 0.28 0.47 0.78 1.10 1.60 2.10 3.00 4.00 5.20 6.75
Peridot 0.17 0.26 0.38 0.50 0.76 1.40 2.00 2.70 3.50 4.30 6.40 9.50 13.00
Ruby/Sapphire 0.24 0.31 0.50 0.60 1.00 1.60 2.20 3.40 4.60 5.40 7.20 12.00 17.50
Topaz 0.21 0.27 0.42 0.57 0.85 1.50 2.00 3.20 4.40 5.00 6.80 11.26 16.50
Tourmaline 0.15 0.25 0.37 0.50 0.75 1.20 2.30 2.90 3.50 4.70 6.90 11.10 14.00
Zircon 0.25 0.40 0.55 0.75 1.20 2.00 2.90 4.00 5.40 7.20 8.80 14.50 19.50
Ocatagon Shape
5x3mm 6x4mm 7x5mm 8x6mm 9x7mm 10x8mm 11x9mm 12x10mm 14x10mm 16x12mm 18x13mm
Quartz 0.27 0.55 0.95 1.50 2.30 3.00 4.20 5.60 7.60 10.50 17.00
Aquamarine 0.28 0.53 1.00 1.60 2.40 3.10 4.30 5.80 7.90 10.90 17.00
Emerald 0.32 0.60 1.00 1.75 2.50 3.30 4.50 5.80 8.00 11.00 17.00
Diamond 0.25 0.50 1.00 1.60 2.70 4.00 5.00 6.70 9.00 13.00 19.50
Garnet 0.34 0.68 1.10 1.70 2.70 3.70 4.80 6.40 8.50 15.50 20.00
Opal 0.27 0.55 0.95 1.50 2.30 3.00 4.20 5.60 7.60 10.50 17.00
Peridot 0.33 0.60 1.00 1.60 2.50 3.50 4.80 6.30 8.80 13.00 19.00
Ruby/Sapphire 0.45 0.75 1.20 1.75 2.90 4.00 6.00 7.30 9.90 16.50 22.00
Topaz 0.35 0.65 1.10 1.70 2.60 3.80 5.20 7.00 9.10 14.00 20.00
Tourmaline 0.30 0.60 1.00 1.60 2.50 3.50 4.60 6320 8.70 13.00 18.50
Zircon 0.44 0.85 1.40 2.40 3.50 4.70 6.60 8.00 11.40 18.30 26.00
Marquis Shape
2x4mm 5x2.5mm 6x3mm 7x3.5mm 8x4mm 10x5mm 12x6mm
Quartz 0.07 0.15 0.20 0.30 0.48 0.95 1.50
Aquamarine 0.09 0.13 0.21 0.30 0.52 1.00 1.60
Emerald 0.08 0.15 0.25 0.37 0.60 1.10 1.80
Diamond 0.12 0.18 0.25 0.34 0.50 1.00 1.75
Garnet 0.10 0.20 0.30 0.40 0.60 1.20 2.10
Opal 0.06 0.11 0.16 0.24 0.37 0.59 1.00
Peridot 0.09 0.15 0.24 0.34 0.50 0.95 2.00
Ruby/Sapphire 0.09 0.20 0.32 0.44 0.75 1.20 2.20
Topaz 0.10 0.19 0.28 0.42 0.68 1.10 2.00
Tourmaline 0.09 0.15 0.25 0.32 0.57 1.05 1.75
Zircon 0.13 0.25 0.37 0.53 0.75 1.40 2.35
Oval Cabochons 5x4mm 6x4mm 7x5mm 8x6mm 9x7mm 10x8mm 12x10mm
Quartz 0.23 0.45 0.78 1.27 2.10 2.96 5.25
Emerald 0.29 0.53 0.75 1.43 2.20 3.00 5.80
Garnet 0.32 0.66 1.07 1.57 2.65 3.48 6.00
Opal 0.12 0.24 0.36 0.55 0.90 1.40 2.25
Peridot 0.29 0.53 0.89 1.36 2.23 3.02 5.40
Ruby/Sapphire 0.36 0.75 1.08 1.97 2.65 4.25 6.50
Topaz 0.41 0.80 1.26 1.90 2.90 4.05 6.35
Tourmaline 0.24 0.85 0.94 1.39 2.27 3.10 5.30
Round Cabochons 3mm 4mm 5mm 6mm 7mm 8mm 9mm 10mm
Emerald 0.12 0.24 0.52 0.97 1.57 1.95 3.16 3.89
Garnet 0.12 0.26 0.57 1.00 1.60 2.50 3.80 4.75
Opal 0.18 0.37 0.85 1.13 1.61 2.59 3.87 5.00
Peridot 0.15 0.31 0.58 0.99 1.47 2.29 3.30 4.65
Ruby/Sapphire 0.18 0.35 0.82 1.49 2.10 3.18 4.90 6.70
Topaz 0.24 0.45 0.91 1.25 2.08 3.00 4.34 5.80
Tourmaline 0.12 0.30 0.56 1.05 1.71 2.20 3.50 4.20