About Gemstones
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About Gemstones

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Diamonds

There are 5-7 ‘C’s’ referring to a diamond (depending upon which source you obtain details from).

The 5 C’s are:

  • Carat
  • Colour
  • Clarity
  • Cut
  • Cost

The additional 2 possible C’s are:

  • Certificate
  • Common sense.

For the purposes of this page, we will be concentrating on Carat.

Carat can be expressed in 4 ways:

  • 1 ct.
  • 200 milligrams
  • 1/5 gram
  • 100 points

0.20 grams is a carat, and is the standard unit of weight for diamonds and most other gems. If everything else is equal, the more a stone weighs, the more valuable it will be. This is not the same as the dimensions of a diamond, as a diamond can appear different sizes but be the same weight, according to the cut. The types of cut include ‘well-cut’, deep or shallow.
All loose diamonds are measured by carat weight. Technically, bigger sized diamonds usually suffer in quality, such as a loss in brilliance. In order to cut loose diamonds at the best angles to produce the most fire, much of the original diamond rough is lost, resulting in a great decrease in the diamond's carat weight.

The larger the diamond is, the rarer it is, making it dearer. For example, a 1-carat diamond will cost more than twice a 1/2-carat diamond (assuming colour, clarity and cut remain constant). The cut and mounting can make a diamond appear larger (or smaller) than its actual weight.

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