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Please take your neat find to a certified Gemologist. Any jewelry store in your area can recommend one to you. What if it turned out to be an incredibly rare huge semi-precious or precious stone? I would definitely have it checked out by a professional before just selling it to someone who says "Oh, it's nothing, just a piece of glass, but I'll take it off your hands for a hundred bucks" type thing, and they turn around and sell it for thousands or much more. I've been in the antiques business for over 35 years, so please take my advice. I've had things that looked like they should have been from a dollar store turn out to be worth hundreds, and in a few cases up to a couple of thousand dollars. Have it checked professionally, and do not let anyone scam it out of you or your friend for a pittance.