12th-13th century AD. A mixed group of plaques and cabochons in rock crystal, garnet, haematite and other stones each with a line of engraved calligraphic text. 6.35 grams total, 9.3-13mm (1/4 - 1/2"). The Signo collection, the property of a West London businessman, formed in the late 1980s-early 1990s. [11]Fine condition.