Luokitukset ovat valmistajien määrittelemiä. AA Grade White MOP: Both sides white and good quality. (It's allowed if few pieces may be with slight defects). AA Grade Gold MOP: Face side gold color and good quality, back side good quality also. (It's allowed if few pieces may be with slight defects). AA Grade Black MOP: Face side dark black color and good quality, back side good quality also. (It's allowed if few pieces may be with slight defects). Abalone: Face side good / high quality, minimum 1/2 of thickness is good quality. Back side may have shallow worms or shell skins or slight defects, all flaws under 1/2 of thickness. Paua Abalone: Face side good / high quality, minimum 1/2 of thickness is good quality. Back side may have shallow worms or shell skins or slight defects, all flaws under 1/2 of thickness.
