Does my girlfriend have to get sized for a diamond engagement ring before I buy it or can I get the diamond ring resized later?

You are not the first person who encountered this sort of problem, of not knowing your girlfriend's ring size. The best thing will be of course to secretly find out your girlfriend's ring size without her knowing it. The simplest way to do this to steal one of her rings and taking it into the jewelry store for proper measurment. If you have a problem to do so, then don't worry about it – you could send it to the jewelry store to get it resized if there is a need to do so. A jeweler would probably suggest you get your girlfriend a size 6, which is the average ring size for women. I would strongly recommend that you make sure with the jeweler the fees entailed in resizing your ring prior to your purchase. In most cases, the jewelry store you are purchasing your diamond jewelry from will not charge you at all for ring resizing costs. Also, make sure to find out approximately how long a resize would take to complete; most jewelry stores will say it takes roughly 3 days. However, if the jewelry store states an estimate which is much longer than that, I would suggest taking your ring elsewhere for inquiry. In any case, if you don't want to spoil the surprise by showing your girlfriend her diamond engagement ring before you actually propose, then you could put your mind at ease: a jewelry store could have your ring easily resized after you purchased it. This sort of thing is very common, and as I said, you are not the first person to do this and definitely not the last!

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I would recommend you either find out her ring size (you can do it here 
http://www.zoara.com/engagement/ring_size), or help her determine her ring size before buying her the engagement ring. Have friends or family ask, or steal a ring of hers that she already owns and bring it to the jeweler to have him determine her size that way. However, if you have to resize an engagement ring more than a half or whole size, it can leave visible marks and damage the ring. Also, depending on the style of engagement ring you want to buy her, it may actually be impossible to have the ring resized. If you get her an engagement ring with intricate design, a ring made of titanium, or a ring that has gemstones channel set more than halfway around the stone, it is not worth the headache to even try resizing the ring. If, however, you are planning on getting her a simple banded gold or platinum engagement ring with one, two or three diamonds on the front, then it should be relatively easy to resize. In fact, many jewelers offer their clients a between one to two months after purchase during which they will resize the ring for free. So take these factors into consideration. Again, it shouldn't be that difficult for you to get a hold of her ring size, which is really what I would recommend you do. I recommend you take a look at online jewelry guides like this one here 
http://www.zoara.com/learning_center for more helpful info.

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Normally, engagement rings can be resized without a problem. Just in case, you should ask the store you buy the engagement ring from what their policy is on resizing tings and which engagement rings can be easily resized. For instance, engagement rings that have diamonds set on their sides would probably be a bit trickier to resize than an engagement ring. Best make sure that there won't be a problem with the resizing of the particular engagement  ring you're interested in purchasing.

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A good friend of mine had a lot of trouble resizing her diamond engagement  ring. Even if you want to surprise your loved one with an engagement ring, you can still find out her ring size and improve the chances that the ring with in the first try.

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