I have a ring I found with the letters EDCO or EOCO written on the inside. It looks real, and the band hasn't turned colors since I've had it, maybe four or five years?. It doesn't have anything else on it and I'd really like to know more about the letters on the inside. I think I should take it to a professional but I really don't know. I want to find more out on my own first. Any help? The band looks profesionally crafted and has sixteen ballpoint pen sized diamonds around it with two slightly larger sized diamonds on the left and right side of a large blue crystal.