A diamond's value is based on its carat weight, its cut, its clarity and its colour. A local jeweler may be able to answer your question given an individual stone.
The answer assumes you mean a ~25.00 carat stone and not a .25 carat stone.Today's search for loose diamonds produced this result:A round stone of 27.12 carats, with a J colour, I1, without a certificate and graded as 'excellent' cut. It is priced at US$576,249.00.
"The market value for natural blue diamonds is very high. They are very rare and highly sought. The average price for a one carat blue diamond may be as high as $150,000."
Half a carat is .50, and a quarter of a carat is .25, therefore 3/8ths of a carat is .375
Diamond of 2 carats (jewelry grade) can be worth 1,000 to 20,000 dollars more or less. Industrial grade diamonds: From experience, about 25 years ago I saw a 40 carat industrial grade diamond valued at $4,000, $100 dollars a carat. It looked like a dirty piece of quartz.
Around 25 - 45 dollars.
If you mean 1/4 carat, that is one quarter of a carat or 25 points (one carat = 100 points) .
A 25 carat diamond will be difficult to find, since that size of stone is larger than most diamond merchants have on hand. For comparison, however, the link below shows the auction price of a 35+ carat stone, which sold for over US$24 million.
25 carat gold is not a standard purity level for gold. Typically, gold is measured in carats up to 24, with 24 carat gold being the purest form at 99.9% gold content. Therefore, 25 carat gold does not exist in traditional gold purity standards.
The price of 9 carat gold per gram can vary depending on the current market conditions. As of now, the average price is around $20 to $25 per gram. It's best to check with local jewelers or online sources for the most up-to-date prices.
A .25 carat round GIA certified diamond in F color and VVS2 clarity costs about $590 and a .25 carat princess diamond in E color and VVS1 clarity costs $510.
25 out of 45 = 56% = Failing grade
This means that the total carat weight is either 25 carats, or .25 carats, depending on the full notation.