diamonds
The most valuable stone is typically considered to be the diamond, followed by sapphire, ruby, emerald, and then semi-precious stones such as amethyst, citrine, and peridot. The value of a stone is determined by factors such as rarity, color, size, and clarity.
diamonds
The jewelry grade (white) diamond that is most valuable is identified as a D-colour stone. In fancy coloured stones, both blue and pink stones are valuable, although red might be the most rare, and therefore the most valuable. See the link, below.
Salem limestone is the official state stone of Indiana.
Very
No, it is one of the most rare stones on Earth.
Because it is rare, beautiful, and timeless -- its natural assets are unmatched by any other gemstone.
Gem
I would think the jade stone is worth 190 Dollars. Empire jade would probably worth 10000 dollars. (because it is the most valuable kind of jade)
Yes, if it is a gem-stone quality diamond.
By weight, a gem-stone quality diamond is more valuable than oil.
The rarest natural diamond colours are probably red, green and blue. If you can find a large stone in one of those colours graded as flawless or very slightly included with a cut that shows off the stone's colour and high clarity, you will probably pay the most per carat for this stone.