What makes a blue pearl a 'B' grade?
A 'B' grade blue pearl although still a good usable pearl, does not display the same characteristics as a 'Gem' and an 'A' grade pearl.
The surface of a 'B' grade pearl is mostly not smooth and can be visibly textured. The lustre of a 'B' grade pearl can be mirror to soft. There may be some surface roughness and the colour may not be as vibrant or eye-catching as 'Gem' or 'A' grade pearls.
What makes a blue pearl Mystique grade?
Your Mystique blue pearl is an 'A' or 'Gem' grade pearl with landscape like patterns of conchiolin.
Mystique pearls have high lustre and rich vibrant colours
The conchiolin presence is striking, beautiful, stunning and creates a sense of mystery.