To say thank you to your beloved for a special Valentine gift, so many ways are there. If you are confused and doubtful, then you can have a look at the list of ways given below:
You can send a "Thank You" card.
Send a return gift for Valentine's Day.
You can also thank him/her for a gift by throwing a surprise party.
A hug is also the best way to thank someone for a gift.
Taking that special person on a dinner date or a long walk will also work.