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Pearl Grading System

OUR GRADING SYSTEM

We shall never exaggerate our pearl grade or quality by advertising with the words "clean surface" as other distributors often do, since naturally pearls are hardly found absolutely flawless. Further, we shall neither say our nacre layer is "AAAA" or "A". Rather, we prefer honestly informing you virtual facts of each pearl grade and specifics.

FRESHWATER PEARL GRADING

SURFACE : BLEMISHES OR MARKS

AAAA.jpg AAA.jpg AA.jpg A.jpg
AAA
AA+
AA
A+

LUSTER

very-high.jpg high.jpg Medium.jpg low.jpg
Very High
High
Medium
Low

SHAPE

round.jpg mostlyround.jpg offround.jpg buttom.jpg drop.jpg
Round
Mostly-round
Off-round
Button
Drop
Surface : Blemishes or Marks AAA : Extremely detailed and up-close study of the pearl is needed to find blemish. (98% up of the pearl surface is clean.) AA+ : Blemish that are present are not easy to find, must be carefully to see blemishes. (95-97% of the pearl surface is clean.) AA : Medium intensity of blemish is found on pearl surface. (86-94% of the pearl surface is clean.) A+ : High and obvious intensity of blemish is found on pearl surface. (80-85% of the pearl surface is clean.)  
Luster
Very High
High
Moderate
Low
 
Smoothness
Very Good
Good
Moderate
Low
 

 

SOUTH SEA PEARL AND AKOYA PEARL GRADING

SURFACE : BLEMISHES OR MARKS

SSAAAA.jpg SSAAA.jpg SSAA.jpg SSA.jpg
AAA
AA+
AA
A+

LUSTER

ssvery-high.jpg sshigh.jpg ssModerate.jpg sslow.jpg
Very High
High
Medium
Low

SHAPE

ssround.jpg ssMostly-Round.jpg ssoffround.jpg ssButton.jpg ssdrop.jpg ssBaroque.jpg
Round
Mostly-round
Off-round
Button
Drop
Baroque

 

 
AAA
AA+
AA
A+
Surface : Blemishes or Marks
95 up of the pearl surface is clean.
85-94% of the pearl surface is clean.
66-74% of the pearl surface is clean.
60-65% of the pearl surface is clean.
Luster
Very High
High
Moderate
Low
Smoothness
Very Good
Good
Moderate
Low

 Nacre Grade

nacre-grade.jpg

Nacre Grad
(Akoya Pearl Only)
Grading - Nacre Thickness
( GIA Pearl Grading System )
VERY THICK : 0.5mm thick on all pearls VALUE = 100%
THICK : 0.5mm thick on most pearls VALUE = 90 -95%
MEDIUM : 0.35mm and 0.5mm on most pearls VALUE = 80 - 85%
THIN : 0.25mm and 0.35mm on most pearls VALUE = 60 - 75%
VERY THIN 0.25mm or less on most pearls 25 - 55%

Pearl Size

size_front.jpg
size_back.jpg

Basic Color Of Pearls

frashcolor.jpg




by ThaiWebExpert.com