The 4 C's
Diamonds are weighed in metric carats. For reference, a small paper clip weighs about two carats.
Diamonds are created by nature under tremendous heat and pressure. Nearly all diamonds contain unique internal characteristics called inclusions and external characteristics called blemishes. Many clarity characteristics are too tiny to be seen by anyone other than a trained gemologist using magnification.
Truly colorless diamonds are very rare and highly valued. The GIA Color Scale uses letters to represent the absence of color, beginning with D (colorless) and ending at Z (light yellow or brown). Color distinctions can be quite subtle and only visible to the trained eye, but the differences can have a significant impact on price.
While diamonds can be fashioned into different shapes, the term “cut” refers to how a diamond’s complex proportions and angles relate to light. A number of factors influence a diamond’s cut grade, including its overall face-up appearance, design and craftsmanship. The GIA Cut Scale for standard round brilliant cut diamonds ranges from Excellent to Poor.