Not sure about the diamond martini. Sounds like the food part is $15 for the drink and the other $15,985 is for an over priced diamond. Not really fair for it to be on the list with the rest, unless you're supposed to drink it, crap it out, and mix it with cat crap coffee.
Are truffles good? I've never eaten them. I'm mixed on caviar. I've had it a couple of times once when I was a kid and I hated it, once a couple of years ago and while it didn't make me gag, I wouldn't run out and buy any.