The first thing I do with any coffee table ornament, whether it's a bit of old stone, a wooden bowl, or some small bronze figure somebody's grandmother used to dust every Sunday, is pick it up and feel the weight of it. Light things feel like an afterthought, something scooped off a shelf in a hurry. The pieces with real weight in your hand, even small ones, tend to be the ones that hold the room instead of just sitting in it.
Where these go wrong is when the table is already busy. A coffee table with a tray, a stack of books, a candle, and a plant doesn't need an ornament on top of all that, it needs one of those things to go. I learned this slowly, over a house that had a table so crowded you couldn't set a coffee cup down without knocking something onto the rug. An ornament wants a little room around it, a bit of empty table showing, the way an old portrait wants a plain wall rather than a busy one. Put a delicate glass piece or a thin ceramic bowl near a table where kids are doing puzzles or a dog likes to jump up, and you're asking for a bad afternoon.
The honest limit here is that an ornament, by itself, can't fix a room. I've seen people buy a beautiful old brass dish or a nice carved piece hoping it would pull a mismatched living room together, and it just sits there looking lonely, like a good hat on a bad suit. These things finish a room, they don't rescue one. If your table, your lamps, and your seating aren't already getting along, sort that out first and let the ornament be the last small decision, not the first big one.
As for wear, this is where I actually enjoy watching things change. Wood ornaments darken and pick up a little sheen from hands and sunlight over the years, the way an old newel post does. Stone stays mostly the same, which I like, it's steady in a way that nothing else in a living room is. Brass and bronze will go dull and spotted if you leave them be, and I'd rather you let that happen slowly than polish the character off something every month. A soft cloth now and then is plenty. Keep anything fragile out of direct afternoon sun if you care about the color holding.
So before I buy one, I ask myself if this piece would still look right on that table in ten years, a little duller, a little more handled, or if it only works new and shiny, straight out of the box.