Property must be valued at its fair market value for purposes of the estate tax. In turn, fair market value normally is determined by a property's "highest and best use," that is, the use which would make the property the most valuable. This is true even if the property currently is not being employed in its highest and best use. For example, if the deceased was using a gold bar as a paperweight, you'd have to base its value on the price of gold per ounce, not on the going rate for heavy paperweights.