There is no such thing as "green morganite". Morganite is the pink variety of beryl. Emerald is the green variety of beryl. So essentially morganite has to be pink. Whenever such a term is used for a monochromatic gemstone, you have to suspect either a fake or synthetic gemstone. If it is indeed spinel, why would they name it green morganite? Further, spinel is usually a reddish or pinkish color, and is rarely green. If you have the ability to post a good photo, please do so.