Seller ants my credit card info

Absolutely, positively DO NOT GIVE YOUR CARD INFORMATION TO THAT SELLER IF THAT SELLER IS NOT A DEALER.  

Think it through....  What is that seller going to do with that card info since he isn't a dealer?  He has no way to process the card or get paid for the transaction.  What to stop that individual, or group, or criminal organization go on a shopping spree at an online jewelry store for things they can easily fence.  They just camp out in front of your home and pick up the orders.  You won't know until you get your credit card bill.  

(Disclosure: I worked for one of the two major credit card organizations for over 20 years, mostly in the security and risk division.)  

If he was Maggie owner I give to him but Raidho guy never be trusted. But he selling so maybe he reformed bad guy.

Run away. 

Credit card Info one cannot give to anyone not even banker OR even your own mother.

seller got a Dodo and you fell for it, any body would have smelled rat.