Geographical origin classification of gem corundum using elemental fingerprint analysis by laser ablation inductively coupled plasma mass spectrometry

► The LDA mapping can separate rubies between South East Asia and African countries and blue sapphires from Madagascar and Nigeria. ► B, Si, Zn, Ga, Sn, V, Mg, Ti, Cr and Fe were effective for classification of blue sapphires from Madagascar and Nigeria. ► The ratio of Si and B concentrations were able to distinguish the Cambodian and the Thai gem corundum.