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How to Read The Different Akoya Certificates for Pearl Science Laboratory


What Color of Akoya Pearls Have?
Akoya pearls have white, silver-blue (gray), and yellow colors.

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Which size can be divided into?
According to the size of the certificate, it can be divided into more than 6mm and less than 6mm.

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White akoya pearls:
The best gem quality > 6mm is named Aurora Tennyo
The best gem quality < 6mm is named Aurora Sairindama

AAA/Reserve quality grades in the "rare" sizes.

极光彩凛珠

Silver-blue akoya pearls:
The best gem quality > 6mm is named Aurora Madama
The best gem quality < 6mm is named Aurora Saiundama

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What is Sairindama?
Sairindama is the same quality as Hanadama, it is the highest quality akoya of the white series with a diameter less 6mm.
What is Saiundama?
Saiundama is the same quality as Madama, it is the highest quality akoya of the blue series with a diameter less 6mm.

Golden akoya pearls

Aurora gold(Aurora 金色) belongs to the golden series, and Aurora Akoya-quene (Aurora Akoya-quene) belongs to the cream system.
Both the uniform necklace and the multicolor akoya pearl necklace can get the Aurora quene certificate.

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What conditions do akoya have can be named as Tennyo? 

Pearl body color (Numeric): below 54.7% (white series)
Gloss (Numeric) : above 6.0 (monochrome)
Surface exhibits minimal to no visible blemishes
Shape: Round ~ Symmetry
Inner Inspection – Thickness of pearl layers by optical fiber with a minimum of 0.40mm.
Diameter: >6mm
天女 (TEN-NYO) Pearls, must first qualify as Hanadama Pearls, and undergo additional stringent tests.
TERI Value Analysis – Light Interference Test, with a minimum score of 90%, known as the aurora effect to qualify as TEN-NYO Pearls.
Certified by Japan Pearl Science Laboratory, with high degree of recognition and level of technology to certify TEN-NYO Pearls.

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What conditions do akoya have can be named as Hanadama?

Pearl body color (Numeric): below 54.7% (white series)
Gloss (Numeric) : above 6.0 (monochrome)
Surface exhibits minimal to no visible blemishes
Shape: Round ~ Symmetry
Inner Inspection – Thickness of pearl layers by optical fiber with a minimum of 0.40mm.
Diameter: >6mm
Certified by Japan Pearl Science Laboratory, with high degree of recognition and level of technology to certify Hanadama Pearls.

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 "Gem" quality akoya, certified Hanadama akoya, certified Ten-nyo akoya,

Mikimoto does clearly prize smooth akoya, though.

Next is the certificate NO-K, (diameter greater than 6mm) called Aurora rose, (diameter <6mm) Aurora Borealis

Most akoya pearls have somewhat hammered surfaces and somewhat textured skins. "Gem" quality akoya 

Blue series: NO-S is the highest quality, named Aurora Madama.
next is NO-K, named Aurora Blue Rose.

The best pearls are expensive no matter who's selling them.

More pink and better matched than the 9.25mm A+, but less lustrous.


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