Essie Go Overboard is a moderately cool-toned, dark teal with a cream finish. It is a limited edition nail lacquer that retails for $8.00 and contains 0.5 oz.
Essie Go Overboard Nail Lacquer ($8.00 for 0.50 fl. oz.) is described as "a limitless sea blue." It's a deep, almost inky, blue with subtle hints of teal--you might call it a very blue teal or a teal-tinged navy blue. MAC Deep Sea is greener and much, much darker. Rescue Beauty Lounge Teal is a bit darker and greener. Illamasqua Viridian is more of a teal. Nothing I could think of was close; everything that was even remotely similar was significantly darker.