Chrysolopus spectabilis (Common names include Botany Bay diamond weevil, Botany Bay diamond beetle and sapphire weevil) is a species of weevil found in south-eastern Australia. It was discovered during James Cook's first voyage, and became the first insect to be described from Australia. The weevil measures up to 25 mm (1.0 in) long and includes distinctive metallic green and black scales. It is found only on 28 species of the plant genus Acacia.