The heavier of the two woods is black ebony. Ebony is denser and heavier than rosewood. On average, ebony has a specific gravity of around 1.05 to 1.10, while rosewood typically has a specific gravity of about 0.85 to 0.95. Specific gravity is a measure of the density of a material relative to water, and a higher specific gravity indicates a denser and heavier wood. This difference in specific gravity is due to the varying chemical compositions and cellular structures of the two woods. Ebony, being a member of the Diospyros genus, has a very tight grain and a high oil content, which contribute to its greater density and weight. Rosewood, on the other hand, comes from various species within the genus Dalbergia, and while it is also dense, it is not as heavy as ebony. This difference in weight is often reflected in the practical applications of these woods, with ebony being favored for its weight and durability in musical instruments and furniture, while rosewood is prized for its rich color and luster.