Gasterhaworthia 'Royal Highness', also known as Gasteraloe 'Royal Highness', is a small succulent plant that forms compact rosettes of firm but brittle leaves covered with white tubercles. It is a slow-growing plant that produces offsets at the base. Leaves are dark green but become paler and take on an attractive purplish hue in full sun. They are triangular with a short, weak bristle tip, strongly convex below, up to 4 inches (10 cm) long, and 1.4 inches (3.5 cm) wide at the base. The hemispherical tubercles are solitary or decurrent.
Flowers are tubular, slightly ventricose, up to 0.8 inches (2 cm) long, and appear on arching or sprawling, up to 3.3 feet (1 m) long inflorescences in summer. The flower buds are pink below and gray-green above. Tepals are white with green mid stripes.