So my girlfriend says she is allergic to platinum. She says this because of a friends Mignon Faget ring that was supposedly platinum. I did some searching online and it looks like Mignon only sells platinum plated products. After some more research, Nickel is usually the culprit of the allergy, which means that switching to White Gold would theoretically increase the risk of allergy because there is more Nickel in it. So this leads me to think a 90-95% pure platinum ring would be the best option, as white gold will have more nickel. All of this hinges on whether or not Mignon puts nickel in their platinum plating. If not, then she might be allergic to platinum. If so, then white gold will be a worse choice. And plain yellow gold/silver isn't an option. Thanks!