Fernando,
Check this out:
These symbols are use to indicate the different degrees of diamond clarity. A perfect diamond is flawless, which means that there is nothing in it in the form of clouds, bubbles or mineral inclusions to block the flow of light by international standard. A diamond is graded with a loupe of 10x power. Inclusions are easily spotted this way.
FL - Flawless. This means that the diamond is pure and without any visible inclusion under 10x loupe magnification.
IF - Internally flawless. It means that insignificant marks or inclusions are seen with the use of the loupe.
VVSI – Very Very slight Inclusion (1). Inclusions are extremely difficult to detect. Almost invisible.
VVS2 – Very Very slight Inclusion (2). Inclusions are still very difficult to detect.
VS1 – Very Slight Inclusion. Inclusions are difficult to see face up.
VS2 – Very Slight Inclusion (2). Inclusions are somewhat easily detected under loupe magnification
SI1 – Slight inclusion (1). Inclusion is easily found under loupe magnification
SI2 – Slight Inclusion (2). Inclusion is very easy to detect under loupe magnification. It may be seen at the pavilion with naked eye.
I – Imperfect or “Pique”. Inclusion can be easily seen even naked or unaided eye.
COLOR
Diamonds maybe of different colors. However, it is the colorless ones that command the highest values. The color tints of diamonds start with yellow.
Diamonds also come in other colors like brown, green, pink, orange and blue. Diamonds in these colors are rare and are called fancies. Colored diamonds do not have as much brilliance as the colorless ones, though.
The following is a chart on diamond color grading. The percentage refers to yellow tint. As the percentage decreases, the yellow tint increases:
PERCENTAGE LETTER
Colorless
100% D
99% E
98% F
97% G
Near Colorless
96% H
95% I
94% J
93% K
Slightly tinted White
92% L
92% M
90% N
Very light yellow
89% O
88% P
87% Q
Light Yellow to
Fancy Yellow R-Z
