<human>: Condense the text into a few key points

We have been together for 2 and a half years as of the 5th of June.  I want to propose to her sometime in November or December.  My price range for the ring is not much of an issue since I have a fair amount saved up from the last few years.

I've never bought her any sort of jewelery before because she really doesn't wear it or anything, so bringing her to a jewelery shop will definitely send some signals her way and I don't want her suspecting anything.

So I'm asking for the people who have been in a similar situation such as myself, how did you pull it off without your SO knowing?  Or did you just accept that they knew you were planning on proposing?
<bot>: Want to propose to my gf, not sure of her ring size and unsure of how to figure it out without sending off any signals.