18th birthday gift ideas. Buying an 18th birthday gift can be difficult, which is why we have hand-picked a selection of amazing gift ideas that will mark this very special day. Whether it is it an 18th gift for him or her, you will find personalised jewellery, personalised wall art, practical leather gifts and many more gift ideas. We want you to find the perfect 18th birthday gift as you help to celebrate this special day with family and friends.