Diamond Buyer's Guide: The 4Cs
Have you considered buying a diamond piece of jewelry? A diamond buyer may have come across a string like 'Cushion cut 0.35 ct H/si 3ex GIA'. This article will help you understand what these markings mean and what factors influence the value of a diamond.
What is a diamond | Characteristics of a diamond
A diamond is an allotrope of carbon and the hardest naturally occurring substance. Diamonds are formed deep underground under immense pressure and heat. Due to their beauty, durability, and rarity, diamonds are highly sought after and valuable.
Diamonds have an exceptionally high refractive index for visible light. This is why brilliant cut diamonds, in particular, sparkle magnificently in all the colors of the rainbow. A diamond is the only gemstone composed of just one element.
Diamond Grading - The 4 Cs | Diamond Value
The value and price of a diamond are determined by four international factors, known as the 4Cs: Carat, Cut, Color, and Clarity.
Diamond Weight (Carat)
The weight of a diamond is stated in carats (ct). One carat weighs 0.2 grams. The size of a diamond cannot be directly deduced from its weight, as the cut affects its external dimensions. A poorly cut stone may appear large for its weight, but it will lack the brilliance of a well-cut stone.
Diamond Cut
Cut is the most important factor affecting the quality of a diamond, as it has the greatest impact on its beauty. The quality of the cut indicates how the diamond's surface interacts with light.
When a diamond is cut to the correct proportions, it reflects light, creating sparkle: brilliance, fire, and scintillation.
- Brilliance: The white light reflected from the diamond.
- Fire: The dispersion of white light into the colors of the rainbow.
- Scintillation: Flashes of light when the stone is moved.
Different Cut Shapes
The round brilliant cut is the most popular, but there are numerous other shapes:
Diamond Clarity
Diamond clarity is assessed based on the number and size of inclusions under 10x magnification.
| Clarity Grade | Abbreviation | Description |
|---|---|---|
| Flawless | FL | Completely pure under 10x magnification. |
| Internally Flawless | IF | No inclusions, only minor external blemishes. |
| Very, Very Slightly Included | VVS1 / VVS2 | Extremely difficult to detect inclusions. |
| Very Slightly Included | VS1 / VS2 | Difficult to detect small inclusions. |
| Slightly Included | SI1 / SI2 | Relatively easy to detect inclusions. Usually not visible to the naked eye. |
| Included | I1 / I2 / I3 | Inclusions visible to the naked eye. |
Diamond Color
Color grading is done on a scale from D (colorless) to Z (yellow). G-J (near-colorless) often offer the best value for money in jewelry.
Lab-Grown Diamonds
Today, lab-grown diamonds are also available. They are real diamonds: they have the same chemical and optical properties as natural diamonds.
- Advantage: Approximately 40–80% cheaper and ethically regulated.
- Note: Resale value is lower than natural diamonds.
FAQ - Frequently Asked Questions about Diamonds
The 4Cs is a system for determining diamond quality: Carat, Cut, Color, and Clarity.
The Cut is considered the most important, as it determines the diamond's sparkle and brilliance.
A GIA certificate impartially guarantees the quality and authenticity of a diamond. It is the most respected quality assurance in the world.