The prospective customer should also beware of the existence of imitations. By the Middle Ages, the use of green glass polished and cut to imitate emeralds was a well - established practice.
हरे काँच को काटकर पॉलिश करना कि वह पन्‍ने की तरह दिखे, मध्य युग तक अच्छा - खासा धंधा बन गया था ।