A small songbird with a long downcurved bill. Male is blackish with iridescent areas: crown glossed greenish or blue, and shoulders, rump, and tail glossed with blue. Throat iridescent reddish-purple in most of range, but blueish in the north Moluccas and Kai islands. Female is nondescript, with a grayish head, white throat, olive upperparts, and yellowish underparts over much of range. In the south Moluccas and Aru islands, underparts are grayish. Juvenile resembles female, but yellower on throat. Inhabits forest edge, open forest, gardens, and scrub in lowlands and hills. Male can be separated from dark-bellied forms of male Olive-backed Sunbird by glossy, iridescent crown and black back. Females differ from Olive-backed Sunbird by absence of eyebrow, absence of white tail tip, white throat, grayish head, and duller yellow underparts. Females lack eye-ring, unlike larger female Brown-throated Sunbird, and are less uniform underneath than female Elegant Sunbird.