Well, I bought a little “one Decade Rosay Bracelet” that’s not blessed. It’s a Crucifix, one Our Father bead, and ten small beads for the decade. Hand-made and not done terribly well, it’s fallen apart once already and I’ve had to rig it back together again.
I consider it a means to remind myself to “Pray Always,” rather than a decoration, though I do find it beautiful, despite (or maybe because of) its flaws. And I’ll use the beads throughout the day to pray decades fo the Rosary. But I don’t consider it a “Rosary.” I have a genuine Rosary for when I pray in church or before bed or what have you.
So I guess it depends on what it is that’s being worn. If it’s a genuine Rosary, no, it shouldn’t be worn like a necklace or jewelry. If it’s not, then it would be better if it didn’t look too much like a real Rosary, I suppose.