Chemistry and Chemical Reactivity (9th Edition)

$0.0854\ cm^3$
The mass of the diamond is given by: $1.50\ carat \times \dfrac{0.200\ g}{1\ carat}=0.300\ g$ And we're given the density ($\rho=3.513\ g/cm^3$), so the volume is: $V=0.300 \div 3.513 = 0.0854\ cm^3$