do you tested dicroism and spectra? According to Lazarelli charts dicroism of emerald is yG – BG and dicroism of aquamarine colorless/bluish – blue/skyblue. I have always problems to see the spectra, but if: Aquamarine should have a different spectrum. According to Lazarelli there is a line in 456 (and a 437 line which is not seen in heat treated samples). In Emerald there are lines in the 580 and between 600 and 700 (the exact numbers differ between IGS and Lazarelli chart).