Diamonds characteristics are defined by their color, cut, clarity, and carat.
Diamonds' color are graded on a scale from D all the way to Z. D is considered the highest and Z being the lowest.
Diamonds with the color I and beyond is considered to be "fancy" diamonds, meaning that they are tinted with color.
Most of the time they look yellowish in color.
These type of diamonds are considered to be "below normal" just the color characteristics make the diamonds to have less value and price.
The same applies to the diamonds' clarity, cut and carat.
For instance, diamonds' clarity is graded on a scale from IF (Internally Flawless) all the way to I (Inclusions).
Diamonds with SI clarity and below tend to have less value and price because these diamonds have blemishes and flaws that are more easily visible when compared to other diamonds with SI (Slightly Included) clarity and up. So below normal diamonds are those that possess the lesser qualities in terms of the 4 C's.
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