Gems Weight Table
(Approximate weight (ct) of some gems according to size (mm) and shape)
*The weights are an average. They can vary considerably depending on the quality of the cut.
| Oval | 5X3 | 6X4 | 7X5 | 8X6 | 9X7 | 10X8 | 11X9 | 12X10 |
|---|---|---|---|---|---|---|---|---|
| Aquamarine / Morganite | 0.21 | 0.40 | 0.69 | 1.10 | 1.53 | 2.31 | 3.19 | 4.23 |
| Kunzite | 0.26 | 0.48 | 0.83 | 1.33 | 1.84 | 2.78 | 3.84 | 5.10 |
| Topaz | 0.28 | 0.52 | 0.90 | 1.43 | 1.98 | 3.00 | 4.14 | 5.49 |
| Tourmalines (Rubelite/ Bicolor/ Green/ Paraiba/ Pink/ Yellow/ Indicolite) | 0.24 | 0.45 | 0.78 | 1.24 | 1.72 | 2.60 | 3.59 | 4.76 |
| Cushion | 5X3 | 6X4 | 7X5 | 8X6 | 9X7 | 10X8 | 11X9 | 12X10 |
|---|---|---|---|---|---|---|---|---|
| Água-Marinha/ Morganita | 0.26 | 0.48 | 0.82 | 1.28 | 2.08 | 2.84 | 3.75 | 5.07 |
| Kunzite | 0.31 | 0.58 | 0.98 | 1.54 | 2.50 | 3.41 | 4.52 | 6.10 |
| Topaz | 0.33 | 0.62 | 1.06 | 1.66 | 2.70 | 3.68 | 4.87 | 6.58 |
| Tourmalines (Rubelite/ Bicolor/ Green/ Paraiba/ Pink/ Yellow/ Indicolite) | 0.29 | 0.54 | 0.92 | 1.44 | 2.34 | 3.19 | 4.22 | 5.70 |
| Octogonal | 5X3 | 6X4 | 7X5 | 8X6 | 9X7 | 10X8 | 11X9 | 12X10 |
|---|---|---|---|---|---|---|---|---|
| Aquamarine / Morganite | 0.31 | 0.58 | 1.00 | 1.57 | 2.36 | 3.41 | 4.52 | 6.11 |
| Kunzite | 0.37 | 0.70 | 1.21 | 1.89 | 2.85 | 4.11 | 5.44 | 7.35 |
| Topaz | 0.40 | 0.75 | 1.30 | 2.04 | 3.07 | 4.43 | 5.86 | 7.93 |
| Tourmalines (Rubelite/ Bicolor/ Green/ Paraiba/ Pink/ Yellow/ Indicolite) | 0.35 | 0.65 | 1.13 | 1.77 | 2.66 | 3.84 | 5.08 | 6.87 |
| Pear | 5X3 | 6X4 | 7X5 | 8X5 | 9X6 | 10X7 |
|---|---|---|---|---|---|---|
| Aquamarine / Morganite | 0.20 | 0.34 | 0.56 | 0.68 | 0.97 | 1.52 |
| Kunzite | 0.24 | 0.41 | 0.67 | 0.81 | 1.17 | 1.83 |
| Topaz | 0.25 | 0.44 | 0.73 | 0.88 | 1.26 | 1.97 |
| Tourmalines (Rubelite/ Bicolor/ Green/ Paraiba/ Pink/ Yellow/ Indicolite) | 0.22 | 0.38 | 0.63 | 0.76 | 1.09 | 1.71 |
| Round | 3mm | 4mm | 5 mm | 6mm | 7mm | 8mm |
|---|---|---|---|---|---|---|
| Aquamarine / Morganite | 0.10 | 0.21 | 0.43 | 0.69 | 1.23 | 1.52 |
| Kunzite | 0.12 | 0.26 | 0.51 | 0.83 | 1.48 | 1.83 |
| Topaz | 0.13 | 0.28 | 0.55 | 0.90 | 1.59 | 1.97 |
| Tourmalines (Rubelite/ Bicolor/ Green/ Paraiba/ Pink/ Yellow/ Indicolite) | 0.11 | 0.24 | 0.48 | 0.78 | 1.38 | 1.71 |
| Square | 3mm | 4mm | 5 mm | 6mm | 7mm | 8mm |
|---|---|---|---|---|---|---|
| Aquamarine / Morganite | 0.12 | 0.28 | 0.51 | 0.84 | 1.28 | 1.83 |
| Kunzite | 0.15 | 0.34 | 0.61 | 1.01 | 1.54 | 2.21 |
| Topaz | 0.16 | 0.37 | 0.66 | 1.08 | 1.66 | 2.38 |
| Tourmalines (Rubelite/ Bicolor/ Green/ Paraiba/ Pink/ Yellow/ Indicolite) | 0.14 | 0.32 | 0.57 | 0.94 | 1.44 | 2.06 |
