An Assembled ‘Emerald’ Rough.

The article focuses on the identification and analysis of a deceptive assembled "emerald" rough specimen purportedly from a new Zambian deposit, which was examined at Guild Gem Laboratories in Shenzhen. Detailed microscopic, spectroscopic, chemical, and X-ray analyses revealed that the specimen was an artificial composite consisting of green glass, quartz, resin, and phlogopite, rather than natural emerald crystals in phlogopite schist typical of Zambian emeralds. The green coloration originated from chromium in the glass and green resin, while resin bonded the components, simulating natural host rock. Additionally, the article discusses Ce-doped lutetium aluminium garnet (LuAG), known commercially as "Lumogarnet," a synthetic garnet material notable for its yellow to greenish-yellow color and strong fluorescence, originally produced for industrial optical applications but now appearing in the gem market.