Precious stones were valued in antiquity as possessing magical and medicinal virtues, as ornaments, and as seals when engraved with a device. Such engravings (intaglios) in soft media like steatite or *ivory are found in early Minoan days; the use of hard stones dates from the middle Minoan age. Late Minoan and Mycenaean gems have a rich repertory of human and animal designs; the favoured shapes are the lenticular (round) and amygdaloid (sling-stone) (see minoan and mycenaean civilization). In sub-Mycenaean and geometric times the art of working hard stones was largely lost. A revival in the 7th cent. bce is usually associated with the island of *Melos, and the commencement of Classical gem-engraving in the 6th cent. is marked by the introduction of the scarab (beetle) form of seal from Egypt. This was soon abandoned in Greece for the scaraboid, which omits the beetle-back. The late 5th and 4th cents. mark the high point of Greek gem engraving. In Hellenistic times the choice of subjects grows restricted, but excellent work was done in portraiture. In Italy the Etruscans used the scarab until the 3rd cent.; gems of the later Roman republic show a wide range of subjects, combined with clumsiness of execution. With Augustus begins the large series of ‘Graeco-Roman’ gems. A period of indifferent work in the middle empire is succeeded by a revival under Constantine I.