Any diamond is worth whatever someone will pay you for it.
Today, on Blue Nile, you can purchase a diamond of about this carat weight and pay between US$16,593 and US$335,713, depending on the cut, colour of colourless, clarity and exact carat weight that you want.
Take your diamond to a certified gemologist and pay for a certificate to verify its characteristics, which will help you establish a fair market price for it.
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A round diamond of this measurement weighs about .03 carats. Your local jeweler may have one for sale. The smallest weight diamond you can purchase today on Blue Nile weighs .23 carats and will cost US$272.
Your 900 pound diamond is worth whatever someone will pay you for it. Since diamonds are not weighed in pounds, but in carats, and since a one carat diamond will cost you between US$2,023 and US17,915 on Blue Nile today, and since a one carat diamond weighs 0.00705479239 ounces, you can calculate the range of prices you can ask for your 900 pound diamond.
Diamonds are measured in CARATS. Purity of gold is in KARATS. A 14 carat diamond would be an extremely large diamond- about the size of a marble. Value is based on carat weight, cut, color, and clarity- but that would be a multi-million dollar stone in all likelihood. But I think you are looking at marking of the metal.
There are 5 carats per gram. The answer is then 3/5 of a gram, or 0.6 grams.
The diamond either weighs 100 points, or a full carat, or it weighs 80 points or 80/100ths of a carat.