gems, ancient gemology, ancient jewelry, garnet, pyrope-almandine, India, locality, species, analytical, almandine

An Early Byzantine almandine garnet engraved with a Christian motif and dated to the late sixth to eighth century provides valuable insight into ancient trade practices. The gemstone was analyzed using nondestructive techniques such as electron microprobe, portable X-ray fluorescence, Raman spectroscopy, and optical microscopy. Its chemical composition, inclusion assemblage, and the distribution of inclusions—dense in the core and sparse in the rim—suggest the stone likely originated from the Garibpet deposit in Telangana State, India. This supports the account of sixth-century Greek traveler Cosmas Indicopleustes, who described the export of “alabandenum” (garnet) from southeast Indian ports along the Maritime Silk Road. Additional support comes from evidence that garnets from Garibpet were used for bead production at Arikamedu, a known port on India’s Coromandel Coast. However, when compared to the characteristics of almandine garnets used in Merovingian cloisonné jewelry, the mineralogical features suggest those garnets came from different sources.