Looking for a certain wine glass

[LA]

I was given a set of crystal wine glasses as a wedding gift and just broke one, so I was wondering how to just purchase one. I am not that familiar with crystal brands and was not sure what type of crystal it was, to even begin looking for a replacement. It has JR at the bottom of the stem. Can anyone tell me who makes it and if possible where to find them? Thanks for any help you can offer. LA