Description Agate Burnisher 1 has a spade-like shape with rounded sides, which helps its user burnish large grooves or indentations. All agate burnishers are highly polished agate stones affixed onto a a wood handle with a steel (or similar metal) ferrule. These tools will allow for its users to burnish properly gilded gold leaf to a a shine. Agate Stone Length (approx.): 1  3/8 inches (3.5 cm) Overall Length (approx.): 9  5/16 inches (23.6 cm)   For other agate burnishers, select from the links below: Round Shapes Dog-Tooth Shapes  Flat Shapes Pointed Shapes