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First, figure out the type of ring you want to buy. Has your girlfriend dropped any hints about the shape of stone or type of metal she’d like? Take a look at her jewelry. Does she only wear gold, only silver or a mix? Is she a classic, conservative gal or an edgy contemporary woman? 

Find a good online jewelry store like Hellkes Ringar (billiga forlovningsringar). Are they trustworthy? Do you have access to the manager? Can you meet with him or her in person? 

Pick a price range, and comparison shop. This is easy enough to do online.

And how the hardest part: figure out her ring size.  You may have to employ Maxwell Smart spy strategies to get it, such as: ask one of her friends or mother to see if they know. Or, take a ring she has and trace it. It’s often ok to wing it, if your jeweler has a guaranteed return or exchange policy.

Good luck!