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Cheap wedding rings doesn't mean your diamond isn't valuable.

Diamonds, Ice, Sparklies, A Girls Best Friend: Whatever you call them how are they valued? The four Cs -- Cut, Clarity, Color and Carats. Your wedding ring may be cheap but that doesn't mean your diamonds should be.

Cut: A diamonds cut influences the brilliance, or light reflecting qualities of the gem, at the same time it enhances the fire of the diamond, or that rainbow quality. A good cut enhances both qualities, fire and brilliance, without sacrificing one for the other. A well cut diamond balances the depth of the diamond to the breadth of the diamond. A poorly cut diamond of the same size can look flat and be more vulnerable to cleavage and breakage.

Clarity: Diamonds are crystalline carbon. The clarity of the diamond refers to the purity of the stone and imperfections within the crystalline structure and on its surface. There is no such thing as a flawless diamond in nature. Sometimes this clarity factor is referred to as the cleanliness of the stone. If a stone is viewed under 10x magnification and no imperfections can be seen, either internally (inclusions) or externally (blemishes), the stone is referred to in the trade as flawless. A microscopic speck of carbon, undetectable by the human eye, can bring down the value of the diamond substantially. There are five commonly used methods for grading clarity. Just keep in mind the cleaner the stone, the more valuable it is, the more it costs.

Color: Diamonds come in colors including black. Most of the darker colors are used for industrial purposes and not for gems. The white-blue color of pure water is the most valued color for white diamonds and these are rated D-F. (There is no A-C on the scale.) As the diamond color progresses toward yellow (K-M) it becomes less valuable. Diamonds that have a noticeable yellow (N-R) to champagne color (S-Z), are the least valuable. Because the color can be influenced by the color of the gems setting, the color is judged when the stone is unset.

To complicate matters and value, diamonds that come in colors, called fancies, are very rare and very valuable. Deep blue, red, and green diamonds are among the rarest and most valuable gems on earth.

Carat: Diamonds and other precious gems are valued on weight, or carats. A carat is 1/5 of a gram. Sometimes diamonds under a carat are valued in points. One carat is 100 points, so a quarter carat diamond can be referred to as 25 points. Diamonds are not valued on their apparent size, since the size can be either enhanced or diminished by the cut. And different gemstones have different densities. An emerald is lighter than a diamond and a ruby is heavier. A one carat diamond, one carat emerald, and one carat ruby would be three different sizes.

The more the diamond weighs the more valuable it is. The price of a diamond is based on carats, but the more the diamond weighs, the higher price it has per carat, all other things being equal, meaning the diamonds are the same in color, cut and clarity. In other words, a one carat diamond may be priced at $10,000 per carat, while a two carat diamond will be priced at $20,000 per carat. The one carat diamond costs $10,000 and the two carat diamond costs four times as much or $40,000. The discrepancy increases the higher the carat weight.

Diamonds of one carat or more can be graded by an independent lab as to the quality of the cut, weight, color and clarity. The certificate is often available at the diamond sellers.

When youre buying a diamond you can choose which factors are more important to you. If you want more carats, you can trade off clarity. If its important the color is as close to pure white as possible, you can get a stone weighing less carats, or perhaps one that has a minor, but not visible to the naked eye imperfection.

You can find a screaming deal on cheap wedding rings just make sure the diamonds are what you paid for.

Find out more about Weddings on a Shoestring Budget You can save on flowers, gifts, the cake and the reception.

Dee Power is the author of several nonfiction books and the novel Over Time. You can find out more about her at her website.