The density of diamond is approximately 3.5 grams per cubic centimeter (g/cm³). This high density is due to the compact, tetrahedral crystal structure of carbon atoms in a diamond.

 

Material Density (g/cm³)
Diamond 3.5 g/cc
Sapphire 3.98 g/cc
Ruby 3.99 g/cc
Emerald 2.75 g/cc
Cubic zirconia 5.65 g/cc