Rosewood is generally heavier than black ebony. This is due to the density of the wood, which is a measure of its mass per unit volume. Rosewood typically has a density ranging from 0.75 to 0.85 grams per cubic centimeter (g/cm³), while black ebony has a density that can vary but is generally lower, around 0.75 to 0.85 g/cm³ as well. However, the specific density can vary depending on the species of rosewood and the quality of the ebony. Despite the close range in density, rosewood is often heavier because it is more commonly used in larger pieces, such as furniture and musical instruments, where its higher density contributes to its weight. Additionally, the grain structure of rosewood can be more compact, which can also contribute to its overall weight.