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Cultured Akoya Pearl Grading


Pearl Grade Description
Hanadama

Hanadama is the Japanese word for spherical flower and is the grade assigned to akoya pearls considered "extra fine" by a pearl grading laboratory in Japan. One important thing to note is that there is a range of quality that is considered hanadama. For example, our AAA could easily pass certification. We guarantee our hanadama to be the finest available as we only submit the finest to be certified.

Each hanadama-grade strand of akoya pearls must be accompanied by an individual, numbered certificate from the Pearl Science Laboratory of Japan to be sold as "hanadama grade."


  • Surface exhibits minimal to no visible blemishes*
  • Shape is perfect round
  • Luster is very strong
  • Pearl exhibits mirror reflection
  • Nacre determined by optical fiber to be greater than 0.4 mm per radius
  • Excellent matching
  • 95-100% of pearl's surface is free of visible blemishes
  • Shape is perfect round
  • Luster is strong to very strong
  • Pearl exhibits sharp reflection
  • Nacre is visibly thick
  • Excellent matching
  • 90-100% of pearl's surface is free of visible blemishes
  • Shape is perfect round
  • Luster is good to strong
  • Pearl exhibits good to sharp reflection
  • Nacre is visibly thick
  • Matching is good to excellent
  • 80-100% of pearl's surface is free of visible blemishes
  • Shape is perfect round
  • Luster is good to medium
  • Pearl exhibits good to medium reflection
  • Nacre depth is medium
  • Matching is good to excellent
  • 70-100% of pearl's surface is free of visible blemishes
  • Shape is round to near round
  • Luster is poor to medium (chalky appearance)
  • Pearl exhibits good to medium reflection
  • Nacre depth is thin
  • Matching is fair to excellent
  • *The Pearl Science Laboratory follows the laws set forth by the FTC that it is considered unfair to describe cultured pearls as "flawless" because no pearls can pass perfect examination under a 10x magnfication. Although you can't see it, the surface of a pearl is textured. For that reason, all certificates will state "very slight" in the blemishing category.