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My name is Karina Lewis. I've been a gem inspector for 10 years now. Some might think it's dull work, scrutinising raw gemstones all day, but I enjoy the quiet focus.
Raw diamonds are examined primarily for 2 qualities, colour and clarity. Gems that don't meet quality standards for jewellery are used for industrial purposes.
D, E and F ratings are given for colourless diamonds, D being the highest rating.
G, H, I and J ratings are given for near-colourless diamonds. G is the best of this group.
K, L and M ratings are given for diamonds with faint colour.
N through R ratings are given for diamonds with very light colour.
S through Z ratings are given for diamonds with light colour.
Clarity requirements are based on 10x magnification.
A flawless diamond has no inclusions or blemishes. These are very rare.
An internally flawless diamond has no inclusions, and permissible blemishes are only visible.
A very, very slightly included diamond has difficult-to-see, minor inclusions.
A very slightly included diamond has minor inclusions.
A slightly included diamond has noticeable inclusions.
An included diamond has obvious inclusions, visible to the naked eye.