Emerald is the old 2007 dark green color, smooth and slightly glossy, with the tassels and old hardware. Evergreen is the newer Resort 2008 season color, a darker green with a more glazed surface and gold studded pulls in place of tassels.
I like the Emerald better. the color on both is similar, however i don't like the studded hardware on the MAM. It looks better on the NIkki