WORLD'S FIRST MASTER GRADING SET for Diamonds, using the latest and highly advanced NANO TECHNOLOGY.
D to M color, Standard International grading scale.
All 10 stones are in 5 different sizes, 2 stones of the same size are 6 colors apart and are very easy to identify.
No need of any eye glass or weighing machine
Each Stone Scale included
Comes in a compact, easy to handle box with clear instruction, good enough to be used even by a new student