Carat Girl deals in authentic GIA Certified Diamonds. GIA Certification is a globally recognised standard to determine the quality of diamonds weighing 0.15 Carats or more. It is issued by the Gemological Institute of America, an independent research agency. The Diamonds are accredited on the basis of their weight, measurement and the 4 C's, and the certification is highly trusted by customers and manufacturers around the world.

Each Diamond is characterized by the 4 C's that define its beauty and authenticity. The cut of a Diamond defines its appearance and is perhaps the most important factor in determining its value. The cutting method can greatly increase or decrease the glow of diamonds. The cut should not be too shallow or too deep. The ideal cut is the result of perfect proportion, symmetry, and polishing. The better a Diamond was cut, the more it will reflect light and sparkle.

GIA's colour-grading scale for diamonds is considered as the industry standard. The scale begins with the letter D (representing colourless), and continues with the increasing presence of colour to the letter Z (representing light yellow or brown). Each letter grade has a clearly defined range of colour appearance. Diamonds are colour-graded by comparing them to stones of known colours under controlled lighting and precise viewing conditions.

The clarity of a Diamond defines its preciousness. GIA rates clarity grades from Flawless to Imperfect 3. A Diamond that is free from any marks or flaws that appear during its formation is considered as the most precious gem, as it has high clarity and brilliance. This in turn allows it to shimmer more and is thereby more valuable.

This factor determines the size and weight of the Diamond and is the easiest one to measure out The heavier the weight - the more valuable is the diamond.