At the risk of having to crawl away with a red face,
I would be surprised if they were just candle holders. They look much more like some sort of of special fruit or sorbet dish, designed for a specific purpose - maybe the bit that looks like a candle-holder was designed to hold some sort of wafer, or even flowers - a kind of table epergne for eating your pudding - pineapple rings and sorbet perhaps.
But this is pure conjecture and if someone can prove they are straight candle holders, perhaps the bowl was designed to catch the wax - an awful lot of it, I suspect.
Sometimes restaurants would commission special serving dishes for specific signature dishes,btw.