Paragon
All else being equal: carat weight, cut, and clarity, a red diamond will always be more expensive than a white diamond.
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.
When buying diamonds you need to consider the 4 C's - Cut, Clarity, Color and Carat. The last one inform you of the size of the diamond. For more have a look at the following http://adiamondvault.com/article/diamond-carat-guide/
Every diamond is valued by its clarity, colour, carat weight and cut. Compared on an equal basis, you will pay less for a black diamond.
Every diamond is valued according to its carat weight, colour, clarity and cut. All else being equal, an fancy intense yellow diamond will cost more than a 'white' diamond.
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.
The largest Flawless, D Colour diamond for sale today on Blue Nile weighs 7.65 carats and sells for US$1,167,550 or US$152,621 per carat. (You can calculate your 10-carat estimate from this per carat value.) You may be able to find a different 'perfect' and differently coloured diamond at an auction house that weighs exactly 10 carats. The diamond could be a Deep Fancy yellow, blue, pink, or other colour. There, the price will be established by the bidders in the room at the time of sale. A deep fancy coloured diamond that is flawless and large will probably cost you more per carat than the D colour diamond, above.
Carat for carat, we usually see a diamond costing more than an emerald. That's a generalization, but it quite accurate. Carats (carat weight or size), cut, color and clarity are the variables that determine price.
A brilliant cut diamond of one carat weighs exactly the same as a mine cut of one carat.
Facets are not part of how a diamond is priced. A diamond is priced by its carat weight, its clarity, its cut and its colour.
When you own a diamond of this carat weight, you can name it whatever you like.
A common misconception. Carat is nothing to do with size. Carat is related to weight and therefore a 1 carat stone depends on the gemstone in question and its cut. 1 carat is 0.2g and a 1 carat round-cut diamond is approximately 6.5mm in diameter. Similarly, since CZ is a diamond simulant, a 1 carat round-cut CZ is also deemed to be one that is 6.5mm in diameter but such a stone actually weighs more than 0.2g because CZ is more dense than diamond.
TW is an abbreviation that denotes the total weight of a diamond. Carat is the term to describe the weight of any gemstone or a diamond. In jewellery pieces with more than one diamond the carats may be described in terms of total carat weight. This is the combined total carat weight of all the stones in the piece.
One carat of diamond in a single diamond is worth more than multiple diamonds -- or chips in this case -- is worth. Any diamond is valued by its cut, colour, clarity and carat weight. Anything is worth whatever someone will pay you for it. You can take your chips to a jeweler who makes jewelery and sell them there.
All else being equal: carat weight, cut, and clarity, a blue diamond will always be more expensive than a white diamond.
All else being equal: carat weight, cut, and clarity, a red diamond will always be more expensive than a white diamond.
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.