The phrase indicates that diamond(s) with a weight of 68 carats is the topic at hand.
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.
Most people think carat is a size. Actually, it is not, it is a weight. Diamonds are measured in Carats. Carats are a metric weight unit with one equaling about the weight of a paper clip or .2 grams. The GIA website has a lot of information on different carat weight.
An 83 carat diamond is a rare stone, an immensely valuable stone, and probably one of a size that no human anyone knows would have a hand large enough to wear it. You can browse the list, below, to find large stones and see their other physical measurements which are determined by each stone's cut
A quarter carat diamond can certainly be set in a solitaire. A quarter of a carot, on the other hand, might look a little odd set as a solitaire, and after a few weeks, will rot.
One can sell a diamond ring on eBay, Craigslist or even on Amazon in their marketplace area. However, an alternative site would be I Do And I Don't which specialises in the sale of second hand diamond rings.
The value of your stone is more that its carat weight -- that's carats, not karats -- including it's colour, cut and clarity. If, on the other hand, you're asking how much a (4K) $4,000 diamond is worth, the answer is probably $4,000.
Second hand in v.good condition £650.
Diamonds come in all shapes and sizes, measured by carat weight. The largest raw diamond ever found weighed more than 3,000 carats, and fit in the palm of a man's hand.
Given that you can purchase ultra-high-quality gem stone grade diamonds for millions of dollars US per carat or industrial-grade diamonds by the pound for a few dollars, there is a very broad range of the value of the mineral diamond. A gem-quality diamond is worth whatever someone will pay you for it. If you have one for sale, best practices dictate that you take the diamond to a certified gemologist and pay for an evaluation as to the diamond's cut, colour, carat weight and clarity. This will help you establish a fair market price you can ask for the diamond. On the other hand, you can buy industrial-grade diamonds by the pound for a few dollars -- if you buy in bulk.
add a second minute hand. If you could add a second minute hand to an analog clock, you would be able to increase the precision by allowing the time to be determined to the second.
24 carat gold is pure (100%) gold, so 1 carat is 1/24 or ~ 4.16666% On the other hand, with precious stones (like diamonds), a carat is a unit of weight (200 mg) rather than a percentage.