Diamonds are graded on a letter scale from D to Z: D, E, or F diamonds have no color detectable to the unaided eye; grad G, H, I, or J are nearly colorless, but a trained gemologist can detect a slight yellow cast. J through Z colored diamonds have yellow or gray color visible to the unaided eye. Diamonds rated lower than I have color that is detectable even to the untrained eye. Those rated J to M have a trace of color, while any diamond with an N or higher carries a noticeable yellow tint
The charts above are clarity plots, which is a representation of the number and size of inclusions typically present in diamonds of a particular clarity grade. Look for a clarity plot on a diamond certificate, or grading report, to get a clear idea of the number and size of inclusions in a particular diamond. From this map, you can perfectly determine a diamond's clarity without even
Gemologists use grades of clarity to describe how many inclusions a diamond has. These grades range from flawless (FL) or internally flawless (IF) to included (I3), with the numbers indicating varying degrees of quality within a grade (1 being the best). Most commonly diamond sold are diamond that has no inclusions visible to the unaided eye, like VS1 and SI1-2. Diamonds of this clarity are much less expensive than flawless diamonds, and will not contain inclusions that would reduce from the splendor of the diamond
In order To get clearer understanding of how thick or wide is a piece of jewelry, you can use US coins for reference. For thicker items you can stack multiple coins to acquire the approximate thickness or the width of your selected jewelry.