Depends on size, clarity, color. There would be a healthy markup if the origin was proven. Compare "palladot", the gem peridot found in pallasite meteorites; cut stones of this material go for far more than terrestrial peridot.
Any diamond is worth whatever someone will pay you for it.
Any diamond is worth whatever someone will pay you for it.
100-10000 USD
Any diamond is worth whatever someone will pay you for it. Z4 is not a common notation that describes a gem-quality diamond.
I think you are asking if a natural clean diamond is worth as much as a natural diamond that is Not considered clean? The answer is no. A clean diamond means that it is clear from imperfections. Now this can mean clear to the naked eye, or clear under a microscope. Of course the diamond that is clear under the microscope is much worth more than a diamond that is only clear to the naked eye.
The value of the 'stone' -- meteorite? -- probably depends on who wants to purchase it and how much the buyer is willing to pay for it. The diamond value, especially of a 'black diamond' may not be as high as its 'from space' value. This is not a large market, so you'll need to discover the market and then ask the question there.
Your answer depends on the quality of the diamond you're buying/ selling.
$300m ish
$100 to $42,000
£2
A diamond is worth what it's worth, regardless of where and how it's set in jewelery. A diamond's worth depends on its carat weight, its colour, its cut and its clarity.
The most expensive diamond, by definition, is priceless.