Presentation Grade is the highest grade of Mother of Pearl obtainable. This grade of pearl has no fractures, defects, discoloration, holes or unfavorable markings.
“A+” Grade is very similar to Presentation grade. Usually, this grade will have one very minor flaw at one end of the scale. This flaw will usually include yellow coloration, and/or a slight fracture. Usually, this flaw can be cut around or trimmed away. In most instances, A+ grade will finish out to be Presentation grade.
“A” Grade is also a very high grade of pearl. Pieces will have a flawless front side. The reverse side will generally have minor shallow fractures, some yellow coloration, and/or a slight worm hole that can be avoided.
“B” Grade is still a workable grade of Mother of Pearl and is commonly used by beginning knife makers or knife makers that make relatively inexpensive knives. B grade Mother of Pearl will still have a flawless front side. The reverse side will have some deeper fractures, more discoloration, a larger “worm” hole that has been filled, and/or some exterior bark.