Mi-Ya Grading Reports - 4Cs of Diamonds


Carat is a measure of weight as opposed to size. Diamond weight is stated using metric carats (abbreviated as ct). One carat is equivalent to 200 milligrams. Large diamonds are rare which is why they are more valuable than the equivalent weight in several smaller diamonds.


The GIA Color Scale begins at D (colorless) and goes until Z (light yellow or brown). Each color grade, or each letter, is indicative of a range of color and it is a measure of how apparent color is. Most diamonds used in jewelry are nearly colorless but they have tints of yellow or brown.


The GIA Clarity Scale ranges from Flawless to I3. Clarity refers to the number of ‘inclusions’ that are apparent. Considering diamonds form in extraordinarily high heat and high-pressure environments, it is rare to acquire a diamond without its own unique internal and external characteristics. These inclusions may appear to be invisible to the naked eye but they can affect the way light is reflected and refracted.


The GIA Cut Scale ranges from Excellent to Poor. When referring to the cut, there are three key attributes: brightness, fire, and scintillation. The brightness is created by a combination of all the white light reflections from the surface and the inside of a polished diamond. Fire refers to the flashes of color. Scintillation describes the flashes of light and dark when a diamond or light source is moved.