Halichoeres lapillus is a compact, fusiform wrasse from the Western Indian Ocean, where it occurs over rocky bottoms and algae-rich reef zones at roughly 5 to 15 meters. Males show a dark red-orange body broken by irregular green stripes, with a distinctive yellow and black mark near the gill cover, while females are greenish to reddish-brown with white and dark-brown spotting. Aquarium specimens are often described by their emerald faces and deep maroon bodies scattered with jewel-like spots, the feature that gives the species its common name. Maximum reported length is near 5.5 inches, and adults in captivity reach about 6 inches.

Adults should be housed in an established aquarium of at least 75 gallons, which provides the open swimming lanes this constantly foraging wrasse demands. A sand bed of moderately sized to fine grain is essential, since the fish buries itself at night and whenever startled; a depth of at least 3 inches allows it to submerge completely. Arrange rockwork with crevices and overhangs so the wrasse can patrol and retreat as it chooses. A tight-fitting lid is not optional, because jumping is a well-documented risk with this species. Water quality must remain stable and clean, as the Jewelled Wrasse does not tolerate ammonia, nitrite, or gradually deteriorating conditions, and its Moderate care level reflects that sensitivity.