A 15/100s carat diamond is on the small side for a single diamond; you may be able to purchase one for US$100 - US$500, depending on its colour and clarity.
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.
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.
The closest we can come to finding such a diamond for sale online is for a 14.03 carat diamond, currently priced at US$781.608. This is an F colour, round cut with clarity of SI1. This calculates to US$55,710 per carat. Can you do the math for a 15 carat diamond? If you want to purchase another gem stone, your price would be different. Also, the metal, design and setting would be an additional expense.
The weight of a carat is equivalent to 200 milligrams, so a two-carat diamond weighs 400 milligrams.
The value of a diamond depends on its cut, its clarity, its colour and its carat weight. A local jeweler can give you the answer you want.
Cubic Zircons are often meant to mimic diamonds. Since CZs have a more dense specific gravity than diamond -- Wikipedia indicates at least 1.6 times that of diamond. This means that carat weight would be less for the CZ to equal the carat weight of a diamond, both being equal in size. Using the number 15 indicates that you're looking for a large stone. In this case, you may want to go by measurement and not by carat weight. For example, a 15 carat, round diamond measures about 16.3mm across the diameter of the girdle. Presenting the data in reverse, a 15 carat CZ will weigh 1.6 times more than a 15 carat diamond: so the equivalent size diamond in weight will be less than 15 carats. Determining the carat weight of a CZ which is 16.3mm across at the girdle can be made by a jeweler who can weigh the CZ stone and give you its equivalent carat weight.
The diamond either weighs 100 points, or a full carat, or it weighs 80 points or 80/100ths of a carat.
Two tenth carat isn't a term usually associated with a diamond. Every diamond is priced according to its carat weight, its colour, its cut and its clarity.
These two measurements are not directly related. If the diamond is cut in a round, brilliant cut, the carat weight may be between .15 and .20 carats. If the diamond is of a different cut, then the carat weight will be different.
Today on Blue Nile, you can purchase a one carat SI1 diamond and pay about US$4,759; and a one carat VVS1 diamond and pay about US$12,252.
Every diamond is valued by its cut, colour, clarity and carat weight. A diamond this large is rare: you may be able to find a comparable carat weight diamond in an auction catalog from Sothebys or Christies.
The carat weight 0.02 in reference to a diamond means that this diamond weighs oh two-one-hundredths of a carat. This equals 0.00014110 ounces.