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Selecting the Perfect Diamond for You

Understand the 4C principles

Carat" is a unit of measurement used to gauge the size and weight of a diamond. In Thai culture, diamonds are often referred to in units called "tang." So, one carat of diamond is equivalent to 0.2 grams or 100 tang. For example, a 0.5-carat diamond equals 50 tang. Carat weight is a significant factor that impacts the price of diamonds. Typically, larger diamonds are rarer to find and thus command higher prices, making carat weight an important consideration when evaluating diamonds.

carat weight grade

Selecting the right carat weight for your diamond is a matter of personal preference and budget. Nevertheless, it's essential to keep in mind that there are other critical factors to consider when buying a diamond, in line with the principles of the 4 Cs.


Cut is regarded as one of the most crucial factors within the 4C principle. It's important to note that "cut" doesn't pertain to the diamond's shape but rather to the quality of the diamond's facets and symmetry. These aspects significantly influence the diamond's sparkle, light reflection (brilliance), light dispersion (fire), and overall scintillation.


TIP: Square cuts that are rated as "Excellent" to "Very Good" are highly favored and widely accepted in the market.

cutting grade

Clarity pertains to the purity of a diamond, considering that diamonds are formed from carbon crystalline structures which can include various blemishes, either more or fewer. These blemishes make each diamond unique. If these imperfections are inside the diamond, they are referred to as "inclusions," and if they are on the diamond's surface, they are termed "blemishes." Diamond clarity is another critical aspect, denoted by the C's, that should not be overlooked.

Diamonds with numerous internal flaws and substantial impurities may obstruct the passage of light, affecting the diamond's appearance. This can result in a decrease in the diamond's brilliance and sparkle.

carity diamond


FLAWLESS (FL): A diamond with no blemishes or inclusions in both the diamond's internal structure and on its surface. This grade is determined when viewed under a 10x magnification loupe.

INTERNALLY FLAWLESS (IF): A diamond that contains no inclusions within the diamond itself when inspected under a 10x magnification loupe.

VERY VERY SLIGHTLY INCLUDED (VVS1, VVS2): Diamonds with very minimal inclusions within the diamond, which are invisible to the naked eye. These inclusions can only be seen with the aid of a 10x magnification loupe and are further classified into two levels: VVS1 for fewer and less noticeable inclusions, and VVS2 for slightly more visible inclusions.

VERY SLIGHTLY INCLUDED (VS1, VS2): Diamonds with few inclusions that are not visible to the naked eye but can be detected with the assistance of a 10x magnification loupe.

SLIGHTLY INCLUDED (SI1, SI2): Diamonds that have noticeable inclusions when viewed through a 10x magnification loupe and, in some cases, may be seen with the naked eye. The inclusions are usually small in size.

INCLUDED (I1, I2, I3): Diamonds with visible blemishes and inclusions that can be clearly seen with the naked eye.


Color, often referred to as "water" in Thai, pertains to the color of diamonds. Diamond color can be categorized into two broad groups as follows:

Fancy Color Diamonds: These are diamonds that exhibit colors other than white. These colors can include shades like pink, yellow, green, grey, red, blue, and more. Fancy colored diamonds are rarer to find compared to colorless diamonds, which makes them more valuable and often commands higher prices.


A clear diamond, also known as a colorless diamond, is often referred to as a white diamond. These are highly favored for wedding rings. Diamond color classifications are established by the Gemological Institute of America (GIA) and follow a scale from the letter D, representing 100% colorless diamonds, to Z, signifying diamonds with a yellowish or brownish tint. ​​

color diamond

Diamond color grading is a crucial method for distinguishing between diamond colors. It serves as an indicator of quality and has a significant impact on the diamond's price. If a white diamond contains a noticeable yellowish tint, the degree of yellow in the diamond can cause its value to decrease. The presence of more yellow generally results in a lower value for the diamond.

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