Gemstone Weight Estimator
Shape
Stone Type
Diameter (mm)
Approximate Gemstone Weight (Carats)
Round
Oval
Emerald Cut
Pear Shaped
Marqiuse
Square Cut
Sapphire or Ruby
Emerald
Diamond
Cubic Zirconia
Aquamarine
Amethyst or Citrine
Topaz
Tourmaline
Peridot
Garnet
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0