What accessory would you/they like best as a gift?
The relationship between jewelry and love is important, meaningful and underappreciated. It should be more widely understood. The most important aspect of jewelry is that it is an ornament: it is meant to be worn, not stored. This is obvious on a superficial level, but it is also the key to the jewelry's deeper meaning. Every part of the desire to give jewelry derives from it actually being worn.
Jewelry has a special role because it is an item of purely aesthetic, not utilitarian, value: a proclamation that needs are surpassed. And in contrast to other things of aesthetic value (e.g. a painting), jewelry's purpose is specifically to adorn the person who wears it. A gift of jewelry is a luxury focused completely on the receiver.