Diamond 4C
Diamond 4C is universally adopted as the assessment standard while approaching the quality of diamonds. The standard was created by the GIA (Gemological Institute of America), it will assess the quality of the diamonds by it's Clarity, Color, Cutting and the Carat Weight.
Diamond 4C can provide a common language for the Jewelry marketers and sellers, whilst make it easier for the consumer to understand about the know-how on purchasing diamonds.
Clarity
As diamonds is a natural mineral, it's normal to find some natural flaws like cracks or impurities in it. The lesser the flaws a diamond have, the higher value it will worth. According to the standard set by the GIA, the clarity of a diamond will be divided from I3 to FL (Imperfect 3 to Flawless). The diamond will be assessing at a standard of 10x magnification. Usually, the price of the diamonds will rise 5% for each level up.

Color
Diamonds is a pure carbon crystallized products; usually the diamond should appeared as pure white. If the diamonds was contaminated by other impure elements such as Nitrogen or Boron, it will appear in other colors, which are known as colored diamonds. As pure white diamonds are hard to find, the diamonds which is selling in the jewelry market is mainly graded as a yellow color collection rather than a white one.
The color of the diamonds can be divided into 22 grades from D-Z under the standard of the GIA.



The lighter the color is, the higher worth of the diamonds. It's best to choose diamonds form Color D - I while choosing your ideal diamonds.
Other than the color of the diamond, GIA also emphasized on the Fluorescence of the diamonds. The fluorescence is used to measure the reaction of the diamonds under the UV light. The reaction can be divided into 5 levels, which are None, Faint, Medium, Strong and Very Strong. It will be best for the consumer to choose diamonds which have non fluorescent colors show while approaching the UV light.

Carat weight
The unit used while measuring the weight of a diamond is Carat (CT). A carat is equals to 200 milligrams. Each carat will be subdivided into 100 points. The Seller will usually refer the diamonds under a carat by the points its own. For example, the jeweler may describe a diamond that weighs 0.5 carats as a ¡¥fifty pointer¡¦. Of course, the heavier the diamond is, the more it worth.

Cut
The cutting of a diamond is essential while determining the shininess and the outlook of the diamond. It need precise artistry to maximize the possible reflect of light through the proportion, Symmetry and Polish of the diamond. The proportion of the diamond will affect the visual effects of a diamond like its brightness, Fire and Scintillation.
Diamonds can be divided into 5 parts, which are the table, the crown, the girdle, the pavilion and the cutlet. If the parts of the diamonds can be cut in a balance measure, the quality of the diamonds will be higher. It will be best for the table to be around 57%-65% of the total length of the girdle while the depth of it is around 58%-63% of the total height.
According to GIA, the standard of the cutting can be divided into 5 Levels from excellent to very poor.

Heart and Arrow
If the Proportion, Symmetry and Polish of the diamonds can co-operate well, the symmetry of \ it can maximize and achieve the Heart and Arrow. Which means that if you overlook the diamond right at the top of it, your will see eight balanced arrows. If you overlook at the bottom of the diamond, you will see eight balanced hearts.
Genuine and sham
By using a 10X Magnifier, you can easily identify the authenticity of the diamond through a few features.
  1. Girdle
    If the girdle of the diamond is in a matt texture, you can observe the lines on it. Since diamonds hardness is the highest among the mineral products, only pellet shape lines will be found on the girdle. If there are any stripe lines on the girdle, the diamond is most likely a fake product.
  2. Link Line
    Because of the hardness of the diamond, the link line of the diamond should be a bit rough. If the link line is all smooth and clean, the product most likely is a fake.
  3. Facet ridge
    For real diamonds, it's hard to find any wear down on the facet ridge of the diamonds.
    If there is any attrition on it, the product should be faked.
  4. Triangular growth pattern
    Since diamond is a natural growth mineral, some triangular growth pattern can often be found on the diamonds. Therefore, if you can find any triangular growth pattern on the Diamonds, the products should be real.
  5. Shape of the damaged parts.
    If there are any damaged parts on the real diamonds, the cut of it should be in a stairs shape. If the products are faked, the cut will result in round or shell shape.

    If you cannot find a magnifier, you can simply breath a breathe on the diamond and observed how the fog shed away. If the fog caused by your breathe shed away immediately, the diamond is real. On the contrast, if the fog still on the diamonds for a while before it shed away, the diamond most likely is faked.
Maintenance of the diamonds
Cleaning of the diamonds
To clean your diamonds, your will need a soft brush, some sonic cleanser like dish-washing liquor, a clean towel and a dryer.

a) First, you can dilute the cleanser with water. Then use your brush to dip in the mix and clean the diamonds gently.
b) Dip in the mix again and clean the Mounting and the ring.
c) Rinse the ring under water.
d) Dry it completely with the towel and the dryer.
Daily Maintenance
There are a few things that you should beware of while taking care of your diamonds.

a) The diamonds should be kept in jewel box made with soft materials. You should avoid putting the diamonds with other jewelry to prevent any friction.
b) Since diamonds are oil soluble, you should prevent the diamonds to approach any oil or chemical materials. You should remove your jewelry before putting on any lotion, perfume or any other cosmetic products.
c) Diamonds and jewelry should be removed before swimming to prevent any harm brought by the chlorine in the pool.
What is GIA
GIA:
GIA (Gemological Institute of America) is a non-profit institution that established on 1931. It is the foremost authority on diamonds, colored stones and pearls around the globe. The institution provides a certification service to the qualified diamonds and stones. Other than that, they also emphasis on the education and the research on the identification on different stones and pearls. The institution was supported by the fund raised from different jeweler.
For any further information, you can visit the official website of GIA

GIA cert sample:


Big certificate


Small certificate

The certificate provided by the GIA will contain all the information about the diamonds. Except of identifying the 4Cs of the diamond, it will also include a full report on the fluorescence, the length and proportion of all parts of the diamonds. After the certificate of the diamond is released, the GIA report number will also be laser printed on the girdle.
There are a few features on the GIA report to prevent any forgery.

  1. The GIA Logo water printed by special white ink.
  2. The GIA report number should be the same with the paper report.
  3. The report should contain the laser security tag by GIA.
  4. The report should contain a QR code which can directly refer you to the online copy of your report on the GIA website.
  5. A certain area of the report will change color when the temperature reaches a certain degree.
Sizing:
It is somehow confusing while deciding the size of the ring. Although different countries will have different measure methods, you can still get the sizing by measuring the diameter or circumference of your ring.
To measure the diameter, you can simply use a ruler to measure it within your ring. For the circumference, you can use a cotton string to wrap around your finger and then measure the length of the ring by a ruler to get the size of your ring.

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