diamond
U 2
A rock may or may not be expensive, depending on what the rock is made of.
The worlds most expensive shell would probably be the sunrise shelll seliing up to 1,000 dollars.
rock isle is the best for selling things :)
Yes, rock drills are usually diamond tipped and are very expensive.
Taaffeite, $1500-$2500 Per carat. It is the most precious gem in the world as of now
No it is not
Scuba diving, as the equipment is so expensive, and it is expensive getting to a given location, from a boat, to dive. It's the 2nd most expensive fun (behind skydiving) you'll ever have.
Powdered moon rock, it's more expensive than powdered diamond (also it's easier on the stomach but the flavour is lacking).
Very
it is a really expensive rock that's really old and rare