I had one that specifically designed for PCOS relief. (I also wear a couple of other bracelets made with gems that have specific attributes that are meant to help with fertility problems.) Anyway I found my PCOS bracelet on Etsy and had it imported from America...it cost me around £30 once I had paid duty on it too. Anyways, I took it off one day whilst I did the washing up and my cat stole it :-| I've not seen it since! I am devastated, have searched our entire house and needless to say me and the cat still aren't on speaking terms! lol However I wear my carnelian and moonstone bracelets and since then I have had 2 periods! I had gone over a year without one before wearing these! So yes I believe in gems/crystals big time! I also wear a Ruby Zoisite necklace. I love my gems and find them really comforting! .x.x.