Any diamond is valued by its cut, clarity, color and carat weight. A large stone such as this would be very valuable, given its size alone, which is uncommon and rare. But a fixed price can't be calculated without the other details.
$60
Any diamond is worth what someone will pay you for it. A black diamond is graded according to the classic four Cs of diamonds: cut, colour, clarity and carat weight. A raw diamond looses about 60% of its carat weight during the cutting process. You could find a diamond cutter willing to work with you to price and otherwise deal with your raw diamond.
Given the date of your question, one could imagine that you are asking about the value of the 8.5 carat diamond just found in the Arkansas Crater of Diamonds state park. Every raw gem-quality diamond looses about 60% of its carat weight when cut and polished, so that diamond will be worth whatever it will be worth in future -- an unknown. You can purchase a diamond of this carat weight today on Blue Nile and pay between US$182.524 and US$1,366,311, depending on the exact carat weight, cut, clarity, and colour that you want. Just so you know, carrots grow in the garden.
The total carat weight (TCW) of all the diamonds in a piece of jewelery weigh -- combined -- 60/100ths of one carat.
A 60-point diamond weighs just over half a carat (.50 carats). The size of the ring is not related to the weight of the diamond.
Yes, of course. When the diamond cutter cuts a diamond and removes part of it, reshapes it and otherwise develops the 'cut', nearly 60% of the total raw-stone, carat weight can be lost.
The value of a diamond depends on its cut, its clarity, its colour and its carat weight. This is true of gemstone-quality diamonds, only 20% of all diamonds mined. The value of an uncut stone, then, is what a diamond cutter is willing to pay for it depending on its highlights of clarity and colour, and how the cutter believes that the stone can be cut to retain its maximum carat weight. Often up to 60% of the raw diamond's carat weight is lost in the planning, cutting and polishing process. An uncut diamond is worth less than a cut diamond, if the diamonds are of the same carat weight. Eighty percent of mined diamonds are considered industrial diamonds, which you can purchase by the bag full for about the price of a latte, depending on your vendor and your purchase frequency.
£45-60 depending on model
A diamond is valued by its cut, clarity, carat weight and colour. A local Mumbai jeweler may be able to show you stones in this category, or direct you to a shop that carries such items.
Any raw diamond can be sold to a diamond cutter for whatever the diamond cutter will pay. The price will depend on the colour and intensity of the blue, the clarity of the stone and the ability to verify that the blue colour is natural, not radiated. When cutting a diamond about 60% of its carat weight is lost. As a first step, best practices dictate that you take your stone to a certified gemologist and pay for an evaluation of the diamond. This document gives you more leverage when working with a diamond cutter, than if you simply approach one not in possession of the value of what you bring in to be cut.
Any raw diamond must be valued by a diamond cutter, because about 60% of any raw stone is lost in cutting. A diamond cutter will cut a diamond to preserve its clarity and colour and finally its carat weight, in that order.
A diamond is valued by its cut, clarity, carat weight and colour. A local jeweler experienced in diamond cutting can look at your stone and give you a precise answer. Remember, about 60% of the stone's weight will be lost in cutting it into a gem shape.