First of all, congratulations, I hope she says yes. There's some things you should know, though, when out shopping for the ring, if you're into that kind of thing. The ring thing.
Here's some terms specific to diamond shopping you should be able to talk with your jeweller.
Outside the brilliant and modified brilliant (a brilliant in the range of but not right on 58 facets), there are also more noticeably different diamond shapes, which are collectively called the Fancy Cuts. One of the most popular for engagement rings is the Princess Cut. This is a square diamond shape that still puts out a lot of brilliance.
