Advice on accessories and stuff

Hello everyone, I want to order an accessory (ring or bracelet) but I don't know which one should I take or where I should look. I want something that is quit simple or not really extravagant. I tried amazon and found several things, but i'm not quite sure if it good:BraceletRing-silver8mmRing-tungsten 6mmRing-tungsten 8mmRing-StainlessI'm actually in france, so US products may not be available for me. But if you have any opinion on it, if you own one or have a more suitable ring for me, let me know!