Learn About Diamonds

At Above Diamond, we are proud to not only act as the source of your jewelry, but also a place you feel able to discuss your requirements now – and in the future.

To assist you best, we’re committed to providing meticulous, detailed information to ensure that you have the best possible advice when selecting your diamonds.

Understand the 4Cs

Jewelers from internationally recognized institutions such as the GIA, HRD or IGI use a 10x microscope to determine the characteristics of each diamond. They specify the details of the diamond with four key characteristics of the diamond, ‘the 4Cs’, which refers to the key attributes of the diamond – of carat weight, color, clarity and cut. These are the main factors indicating the quality and beauty of each diamond.

We find with a little basic knowledge about the principle of viewing a diamond’s certificate it will help to buy stones that match your taste and budget.


A carat is the measurement used to weigh a diamond, with a 1 carat diamond weighing 0.2 grams and equal to 100 ‘points’. If a diamond weighs less than 1 carat – for example, 0.30 carat – it is popularly referred to as a ‘30 pointer’.

Among the 4Cs, carat is the only factor that can be measured technically, a process completed using special precision scales which obtain the stone’s exact measurements.

However, it’s worth bearing in mind that comparing the price of diamonds by carat weight alone is no different from comparing the value of a work of art by size. For instance, a large painting by an unskilled artist could not compare to a small painting by Picasso. Therefore, diamonds which are of the same carat but varying sizes will have the same points, but completely different prices. The decision on overall value thus depends on the other factors within the 4Cs.

This said, in general, diamonds that are larger in size and carat weight are rarer. Commensurately the larger the diamond the higher price. The price also goes up at each ‘staging post’ in the carat weight, not higher in a directly proportional manner, but more in an exponential way.

Choosing the right carat weight is a matter of choice and budget and Above Diamond gives you the option to choose diamonds directly from among the largest diamond cutters in the world through our website, making it easier to choose a size that is right for you.


Diamonds can come in a variety of colors such as blue, pink or even yellow. The most popular color for a wedding ring is a white diamond, as being colorless it is the ultimate symbol of purity.

Currently, the white diamond color designation is based on a universal principle developed by the GIA Institute, which goes from the letter D (colorless) to Z (yellowish). In some cases, if a diamond color is in the fancy color range, such as blue, pink, or yellow, another set of criteria will be applied to indicate the diamond’s color.

Diamond color can have a significant effect on price, for example, a D-color diamond is the most colorless diamond with the least tint of yellow which makes it extremely popular among diamond purists. Therefore, D-color diamonds tend to possess a higher value than diamonds that contain any yellow tint.

Every diamond from Above Diamond has its color tested according to the GIA international standard to ensure that there is no chromatic aberration. This includes the correct lighting test environment, so our jewelers can completely accurately measure the color of a diamond before it is delivered to you.


Clarity refers to the absence of inclusions and blemishes of the diamond. In most natural diamonds, there will almost always be defects either on the inside or outside the diamond. It’s like a mole on the body of a newborn baby. It is a characteristic that will express the uniqueness of every diamond.

In the language of diamonds, clarity is defined as the smallest and the amount of blemishes. The location of the defect also affects the ease to view those inclusions. For example, a diamond with a flaw on the front is more easily visible than the outer edge of the diamond. In addition, if the diamond has a large number of defects, this may obscure the light that hits the diamond and affect the play of light through it.

Diamond clarity is probably the second most significant factor that determines the value of a diamond. The cleaner the diamond is, the higher its price. For example, the IF level of clean diamonds will almost always possess a high price. Diamonds will be discounted in price if they are below the SI clarity level because you may be able to defects with the naked eye.

In general, more than 1 in 3 diamonds sold around the world have undergone lab-based ‘wound healing’ processes. By firing a straight line laser onto the flaw and adding acid through a tube it makes the flaw appear smaller, which in turn makes the diamond look even clearer. However this process will result in a decrease in the value of the diamond. At Above Diamond, our policy is never to sell diamonds that have been through such a wound healing process.


When discussing the ‘cut’ we don’t just consider the shape of a diamond but also the quality of its cut, through measures such as proportion, texture and symmetry. The beauty of a diamond depends largely on this factor.

Within this, your choice of diamond is affected by three factors that can be seen with the naked eye, namely its brilliance – the sparkle caused by the refraction of light within the stone, fire – the rainbow effect that is produced when white light disperses within the diamond and scintillation – the pattern of bright and dark areas created by reflections when the diamond moves under light.

The cut is another factor that can be used to indicate the value of the diamond. For example, Triple Excellent cut diamonds are priced higher than those that are Very Good, Good, Fair and Poor respectively. When classifying round diamonds, Excellent or Ideal Cut have the most perfect proportions. Furthermore, if ‘Hearts & Arrows’ exist in that stone, it will make the diamond even more beautiful, because H&A diamonds require the highest standards of craftsmanship and take far more time than normal faceted diamonds to cut. In addition, around 15% of the diamond must be discarded to get the perfect cut – little wonder a diamond with H&A is valued so highly.

We have a special collection of diamonds called ‘Above Ideal Cut™’, for which less than 0.1% of the world’s diamonds qualify. This is a diamond that our jewelers have carefully selected to the highest standards. Our Ideal Cut diamonds will ensure a magical piece of jewelry and treasured family heirloom.

Handmade in Bangkok since 1959

Every piece of our jewelry is crafted in our Bangkok studio by experienced artisans in a unique atmosphere of creativity and originality.

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