There are charts, but I think a lot of it is a good faith estimate. I can’t imaging having to take my jewelry box in and having it all appraised, far easier to say $10,000 in antique and modern jewelry.
Cars, I know, there is a chart for. Like a $30,000 prius is a class 5 vehicle, you pay $124 in taxes on it the first year and 20% less each additional year until you come down to $7,000 in value (class 1 vehicle) when you pay $20 a year. (I happen to own a Prius V Wagon, so I had just looked up the numbers.)
I know, I, the ultra conservative, gas and burn the forests and take all the children and animals out back and shoot them with a bolt gun, has a prius. Hey, I was never that mean, neo-con I was made out to be! lol. However, it does warm the cockles of my heart to think of the forest lands being destroyed by the mines that mine the minerals to make the Prius (and other hybrid) batteries in Canada! Not that I am anti forest, I am just anti yuppy snobs thinking they are better than everyone else because they drive a hybrid! (and all pine trees must die. If it’s green in the winter when there is snow around, it is infested with demons and must die!)