Other forms: collectibles
An object that's valuable enough to you that you really want to own it is a collectible. Think of your grandpa's collectible coins or your cousin's collectible baseball cards.
Use this word as a noun or an adjective, to describe anything that people like to collect. Some collectibles are quite valuable, like a collection of antique diamond rings. Others have value only to the collector, like your sister's collectible school lunch menus. Collectible is derived from the Latin colligere, "gather together."