Pear Grading
Pearl Grading
|
A |
AA |
AAA |
AAAA |
Aurora HANADAMA |
Aurora TEN-NYO |
GRANPEARL/SUPEARL |
INFORMATION
|
Low Quality Japanese Akoya representing the bottom 50% of pearl harvest (Not Sold at Annie Case) |
Medium-Grade Japanese Akoya representing top 60% of Harvest. Commonly found at jewelry stores and Major Department Stores (Not Sold at Annie Case) |
High-Grade Japanese Akoya representing the top 5-10% of a pearl harvest. Found in Finer Jewelry Stores. |
Gem quality Japanese Akoya representing the top 1-5% of a pearl harvest. PS. This is the same quality level equivalent to HANADAMA , only without the PSL certificate as the HANADAMA designation is only given to strand pearls not the single ones.Found in brand name/high Jewelry Stores. |
Gem quality Japanese Akoya representing the top 1-5% of a pearl harvest。Special designation for pearls that have passed series rigorous test of Pearl Science Laboratory of Japan and must be accompanied by a numbered certificate by Pearl Science Laboratory of Japan. Same for designation MADAMA for silver blue natural color HANADAMA pearl .Found in brand name/high Jewelry Stores. |
Top gem quality Japanese Akoya representing top 1% of a pearl/HANADAMA harvest. Special designation for pearls that have passed series rigorous test of Pearl Science Laboratory of Japan and must be accompanied by a numbered certificate by Pearl Science Laboratory of Japan.Found in brand name/high Jewelry Stores. |
Rarest quality pearl possible. Collector’s choice . Single digits of these certificates per harvest are given by Japan Pearl Export And Processing Cooperative Association.Rarely found in the market. |
SURFACE |
Heavy blemishing with only a 50% or less clean surface. |
Minor to medium blemishing with a 70-80% clean surface. |
Minor blemishing with at least 90% of the pearl surface clean.
|
Clean surface .With very minor to no blemishing with at least 95% of the pearl surface clean.
|
Clean surface .With very minor to no blemishing with at least 95% of the pearl surface clean.
|
Virtually flawless. 99% or cleaner pearl surface with either very minor to no blemishes visible.
|
100% flawless |
LUSTER
|
Poor
|
Medium
|
High
|
Excellent/Mirror-like reflection |
Excellent/Mirror-like reflection |
Superior/Mirror-like reflection/With interference color under Aurora viewer |
Superior/Mirror-like reflection |
NACRE |
Thin |
Medium
|
Thick
|
Very Thick
|
Very Thick > 0.4mm
|
Very Thick > 0.4mm |
Very Thick > 0.4mm |
SHAPE
|
xRound |
Medium
|
Perfectly Round/Round |
Perfectly Round |
Perfectly Round |
Perfectly Round |
Perfectly Round |