The average cost of a diamond ring depends on a number of factors; namely the cut, weight, clarity, color and carat. All these factors have a grading system as well, which determines the price of the diamonds. Other factors include the cost of manufacturing as well.
You can buy one today on Blue Nile and spend from US$250,000 to US$1,250,000, depending on the cut, colour and clarity of the stone you want to buy.
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A carat, in relation to diamonds, is a unite of mass that is equal to 0.2 grams. Meaning a 4 carat diamond weighs just over .8 grams and an 8 carat diamond is 1.6 grams.
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The rating is apparently 5 8 carat diamond studs in 14 [K] gold with VVS1 clarity, according to your certificate.
Today, the only yellow diamonds available for sale on the Internet in that carat-weight range with GIA certificates are are:5.03 Carat Fancy Yellow, Cushion, VVS1, US$56,92811.01 Carat Fancy Yellow, Radiant, VS1 US$252,900So, the diamond you want to buy will cost you somewhere in that range.If you're selling such a diamond, best practices dictate that you pay for a GIA certificate, which will give you an approximate value of the stone, based on its individual characteristics, as above.
The value of a diamond depends on its cut, its clarity, its colour and its carat weight. You can buy a round, fairly high-quality stone today on Blue Nile in the 10-carat range (8 carat or 12 carat) and spend US$1.1 or US$1.2 million. A local jeweler may be able to show you the stone you want to buy. If you have a diamond of this size and want to sell it, best practices dictate that you pay for a certified gemologist to document the diamond's characteristics. This will help you establish a price for your diamond.
A 1.75 carat diamond billiant cut is about 7.8 mm and a 2.00 carat stone is about 8.2 mm at the girdle. In order to know the exact carat weight of a stone, one must take it to a certified gemologist and ask that it be removed from its setting and weighed.
Carat is a tolerated unit of mass for jewelry and precious stones: 4 carat is o,8 g.This is approx. equivalent to 0,4.10e23 atoms of carbon.
Half a carat is .50, and a quarter of a carat is .25, therefore 3/8ths of a carat is .375
The mm size of a diamond stone relative to its weight in carats is directly related to the cut and the excellence of the cut. For example, a round brilliant stone measuring 8 mm in diameter at the girdle weighs about two carats. A different cut will have a different weight in carats.
Whatever you have to sell is worth what someone will pay you for it. Best practices dictate that you take your diamonds to a certified gemologist and pay for documentation for each diamond, according to each's cut, colour, clarity and carat weight. Then you will be better able to establish a market price for them.