Buying items on eBay from China

I have found some amazing looking crystals and geodes on eBay from a few sellers in China. They have a 99% rating and many many reviews. But still I am hesitant. Has anyone here bought over eBay before form sellers in China? I don't want to buy fakes, I know items can be died or colored. Just looking for some advice.

Here are two of the sellers I am looking at. goodluckcrystal008 beijingbest