I think its unusual for an almost 3 year old, to comment on ones jewelry!
If I'm wearing something new, he almost always comes up to me and says, "I like that".
I'm happy he does, and even try to encourage his interest in rocks & stones, etc. Of course, he loves to "bang" on things with my tools, I try to keep that at a minimum, or give him my rawhide mallet to play with.
Maybe he'll pursue the jewelry field when he grows up!