The rarest piece is not always the one its owner would reach for first.

Value and attachment are measured on different scales. A scarce item is scarce because few people have one, which says something about the market and nothing about what it is like to hold. Owners usually know this and reach past the prize for something ordinary that fits the hand or carries a memory. Prices are set by other people, affection is not.

Look at what you own that you would replace first if it broke, then at what is worth the most. Where those are different objects, the difference is the more honest guide to what you actually like.