The meaning of diamond color f-g is that the diamond color grade is F-G. F-G grade diamonds are classified as high-quality diamonds between colorless and near colorless grades. The diamond color grades from high to low are D E、F、G、H、I、J、K、M、N， The closer it is to level D, the better the diamond color.
Diamond color grade
1. First level
D-E level: extremely white, also known as "special white", "extremely bright white", "clean water color".
D color: pure colorless, extremely transparent, visible extremely light blue.
E color: pure colorless, extremely transparent.
2. Second level
F-G level: Excellent white, also known as "bright white".
F color: It appears colorless and transparent from any angle.
G color: Diamonds weighing less than 1ct appear colorless and transparent when viewed from the crown and pavilion, while diamonds weighing more than 1ct display a faint yellow (brown, gray) hue when viewed from the pavilion.
3. Third level
H-grade
H color: white. Diamonds below 1ct cannot be seen to have any color tone from the crown, while from the pavilion, a faint yellow (brown, gray) tone can be seen.
4. Fourth level
I-J grade: Slightly yellow (brown, gray) white, also known as "pale white" or "commercial white".
Color I: Diamonds with a crown size of less than 1ct appear colorless upon observation, while those with a crown size of less than 1ct appear slightly yellow (brown, gray) upon observation.
J color: Diamonds with a crown size of less than 1ct appear almost colorless when observed, while those with a crown size of less than 1ct appear slightly yellow (brown, gray) when observed in the pavilion.
5. Level 5
K-L grade: light yellow (brown, gray) white.
K color: The crown appears light yellow (brown, gray) white when observed, while the pavilion appears very light yellow (brown, gray) white when observed.
L color: The crown appears light yellow (brown, gray) when observed, and the pavilion appears light yellow (brown, gray) when observed.
6. Level 6
M-N level: light yellow (brown, gray) color.
M color: The crown appears light yellow (brown, gray) when observed, while the pavilion has a distinct light yellow (brown, gray) color when observed.
N color: Diamonds have a distinct light yellow (brown, gray) color when viewed from any angle.
7. Seventh level
N： Yellow (brown, gray) color.
For this type of diamond, non professionals can see that it has a distinct yellow (brown, gray) color.