It depends on the seller and quality but on average it is worth about $196 per carat
Another Answer
According to the link, below, the average purchase price is slightly higher for one carat of black diamond: US$1,015 to US$1,450.
First, understand that if your 'one carat' diamond has '80 points', it may not weigh one carat. Then, take your diamond to a certified gemologist who can tell you 'how much' can be attributed to your diamond.
1 Carat = .2 grams = 100 points
The diamond either weighs 100 points, or a full carat, or it weighs 80 points or 80/100ths of a carat.
If we select top qualities for a white diamond then a 1 carat round cut, H color, Si1 clarity, and excellent cut with GIA certification can cost you approximately $5258. A 1.29 carat cushion cut black diamond can cost upwards of $1,500.
If it is 1 carat weight=.20g .5ct= .10gms and so on you need to know how much it is carat the multiply carat with .20g
too many varibles to answer
A diamond is valued by its cut, clarity, carat weight and colour. A local pawn shop can look at your stone and give you a precise answer.
The cost of Platinum diamond earrings will vary greatly depending on the carat weight of the diamond. As an example for prices, 1/2 carat total weight start at about $1400 but a 1 carat total weight sells for approximately $3600 per pair.
A one carat diamond weighs one carat, or .20 grammes.
250 carat Diamond- uncertain amount as can be auctioned; very few diamonds of this size25 carat Diamond- $1 million to $2 million; for a lower quality stone2.5 carat Diamond - $5,000~$8,000Another AnswerYou can buy a 2.5 carat diamond today on Blue Nile and spend from US$12,000 to US$16,000.Also, a 15 carat diamond is available on Blue Nile today for just over US1,000,000.
One carat diamond weight is equal to .20 grammes.
Every diamond is valued according to its cut, colour, carat weight and clarity.