Is it rude to ask if someone has used a gift you gave them?

[Mikayla]

I agree with the majority.  To me, asking a recipient about the status is no different than framing a painting you draw, giving it to a friend or relative, and then asking where it is the next time you visit. 

When you don't know for sure that this is their favorite place (or they love your artwork!) it's never ok to possibly put them in an awkward position.

[Surianne]

I agree with everyone who said it's not okay to ask.  I think it's lovely if you enjoyed the gift and want to share what you ate at the restaurant, how you used the spa gift card, etc., but for the giver to ask just puts the recipient on the spot, and it implies some obligation to use the gift "properly" (by a certain time, for a certain thing, for yourself even if you don't like it, etc.) which is awkward all around.