Well I believe in, have studied and am practised in astrology and numerology. Do those count as a superstition? (for those of you who say yes, Isaac Newton has a great quote on the matter. When asked why he bothered with things so openely ridiculous as alchemy and astrology he responded "I have studied it sir. You have not." Today we recognize alchemy as the earliest form of chemistry and Issac Newton remains one of the most well known scientists in history. Is it possible he knew what he was talking about?)
Oh, and I hate to be around diamonds. Won't touch them if I can avoid it and I steadfastly refuse to purchase them for anyone I care about. They're the most unlucky rock on the planet.