Do you know about 4Cs? (Source: www.gia.edu)
Diamond color, clarity, cut and carat weight are collectively termed the “4Cs” – the factors that, when combined, define a diamond’s quality and ultimately determine its value.
Diamond color is all about what you can’t see. Diamonds are valued by how closely they approach colorlessness – the less color, the higher their value. (The exception to this is fancy color diamonds, such as pinks and blues, which lie outside this color range.)
Because diamonds formed deep within the earth, under extreme heat and pressure, they often contain unique birthmarks, either internal (inclusions) or external (blemishes).
Diamond clarity refers to the absence of these inclusions and blemishes. Diamonds without these birthmarks are rare, and rarity affects a diamond’s value. Using the GIA International Diamond Grading System™, diamonds are assigned a clarity grade that ranges from flawless (FL) to diamonds with obvious inclusions (I3).
Cut quality is the factor that fuels a diamond’s fire, sparkle
The GIA Diamond Cut Grading System for standard round brilliants in the D-to-Z color range is based on the assessment of seven components (brightness, fire, scintillation, weight ratio, durability, polish, and symmetry). Each component is assessed individually, taking into account the relative importance of that component in the overall cut quality of the diamond. Each cut grade, based on a relative scale from Excellent to Poor, represents a range of proportion sets and face-up appearances.
Diamonds and other gemstones are weighed in metric carats: one carat is equal to 0.2 grams, about the same weight as a paperclip. A carat is divided into 100 points. For example, a 50-point diamond weighs 0.50 carats.
Two diamonds of equal weight can have very different values depending on the other members of the Four C’s: clarity, color