We received a college graduation announcement, but not an invitation to any party. Do we send a gift, or just a congratulations card?

I didn't graduate college, but when I graduated high school I didn't have a party, and some people sent me a little something. I know college is different than high school, but most people sent me money, usually in the amount of $50.

I hope that gives you some idea of what you may be able to send :)

If you were not invited to nor are attending a party, then a card is appropriate.

A congratulations card will be just fine! If you feel the need to do more you could add some cash to it ($20). He/she will appreciate it!