You can buy a diamond about 13 carats from Blue Nile today and spend between US$535,000 and US$1,763,000.
Then you'd pay for the metal setting for this stone.
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The weight of a carat is equivalent to 200 milligrams, so a two-carat diamond weighs 400 milligrams.
A diamond with the indicator SI -- Slightly Included -- indicates that the stone is as badly flawed as possible to still be graded as a gem-quality stone. The other factors: its cut, its carat weight and its colour, however must also be considered when asking the cost of a diamond.
The diamond either weighs 100 points, or a full carat, or it weighs 80 points or 80/100ths of a carat.
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.
There are 5 carats per gram. The answer is then 3/5 of a gram, or 0.6 grams.