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.
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.
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.
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.
Is it a gold ring? If it is the 15 pts means it is 9 carat gold. Not sure about thr other stamp though.
A quick search found a commercially-available 15 carat stone, for which you will pay US$1,187,000+. You'll need to look hard to find a 20 carat stone for sale without finding an auction that has one that large in its catalog for sale. Once you purchase the diamond, then you'll have to pay for the setting.
1 carat can be up to $22,000. Diamonds can be up to $1,000,000 or more. The price varies greatly, and depends mostly on these four specifications: cut, clarity, colour and carat (weight of a jewel).
A carat is a standard unit of measure that defines the weight of a diamond. One carat is equivalent to 200 milligrams. Carat sizes are also expressed as “points”, with a one carat diamond equaling 100 points, a one-half carat diamond being 50 points, a three-quarter carat diamond being 75 points, and so on.
Since diamonds are valued according to more than the carat weight, including colour, cut and clarity, you can shop at a local jeweler who can show you stones of this category, or refer you to someone who can. Shopping today on Blue Nile, where diamonds weighing just over 15 carats are available, you can buy one and spend between US$625,000 and US$1,558,000, depending on the cut, clarity and colour of the diamond you choose.
Back in the 1950s engagement rings ranged in price from a few hundred dollars and up depending on the style, diamond size, and metal type. Remember, this period was shortly after the war, and money was tight. A small diamond (.15 carat) solitaire white gold ring would cost around $100 at that time. A ring with a .25 carat stone done in platinum would cost roughly $300 to $400. Any ring that was a filigree setting or had accent stones would cost more, due to the workmanship and additional stones.
The strict answer is that that a 15 carat stone weighs 15 carats. You probably want to know how big the stone looks. Use the link, below, to get a visual idea of about how large a stone might look depending on its carat weight, and its cut. If the 15 carat stone is a brilliant cut, the stone would be about 16.3 MM across at the girdle.