In relation to most simulants, how does diamond's SG and heft compare?

• A. Higher SG and heft
• B. Lower SG and heft
• C. Higher SG but lower heft
• D. Similar SG and heft

Answer: (B)

Density differences are what this question hinges on. Diamond has a specific gravity of about 3.52, which is lower than many common diamond simulants—cubic zirconia, YAG, and similar materials—whose densities are higher (roughly 4–6 for most of the well-known simulants). Because density is a measure of how much mass is packed into a given volume, a gem with lower density will weigh less for the same size. That lighter weight is what we mean by a lower heft. So, relative to most simulants, diamond sits with a lower SG and a lighter heft. (Note: some exceptions exist, like moissanite, which can be near or a bit lighter than diamond in density, but the general trend with the common simulants is that diamond is lighter for its size.)