White Gold

Akoya Pearl, Diamond



Shipping Date

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Shipping & Returns

All NIWAKA orders include complimentary shipping. Items with an indicated shipping date will be sent within the designated period. For other items, please contact us to request information. Apart from defective items, we do not allow returns, refunds or exchanges.

Payment Methods

We accept the following payment methods: Credit cards and debit cards (VISA, Mastercard, American Express, Diners Club, Discover and JCB) or PayPal.

Jewelry Case & Gift Wrapping

All jewelry comes in beautiful cases and gift boxes from NIWAKA.

Item Details

  • Superior Grade or Higher
  • Pearl Diameter: Approx. 8 mm
  • Total Carat Weight of Melee Diamonds: Approx. 0.07 ct
  • Diamond carat weight may vary slightly.
  • Ring Width: Approx. 2.5 mm (maximum)
  • Japanese Ring Size: 6–15
  • Each item comes with a pearl grading report and a jewelry cloth.
  • The design will look different depending on the ring size.


NIWAKA Pearl Evaluation

For the SHIROSUMIKA collection, NIWAKA uses high-quality Akoya pearls that require no color treatment. In order to carefully select extraordinary pearls, NIWAKA has established its own strict and objective evaluation criteria for a rigorous assessment of each pearl based on color, luster, surface quality, size and shape. After stringent examination, NIWAKA pearls are classified into five grades: Special, Special+, Superior, Superior+ and Superior++.

Special Grade

Special Grade

These pearls have an exquisite white hue that gives an impression of clarity and depth with a soft, translucent glow. They require no color treatment and are characterized by a high ranking in every category of NIWAKA’s pearl evaluation.

Special+ Grade

Special+ Grade

This grade is assigned to the small percentage of pearls that exhibit very subtle pink overtones without any additional color treatment. These pearls have a high ranking in every category of NIWAKA’s pearl evaluation, and the rare coloring makes them even more precious.

Superior / Superior+ / Superior++ Grades

Superior / Superior+ / Superior++ Grades

These magnificent pearls are of the highest quality, selected for their extraordinary beauty and rarity. Every pearl in the three Superior grades has a slightly pink hue, a particularly elegant shimmer and a powerful presence. These extremely rare treasures account for only 0.002% of pearls cultivated in Japan.

Pearl Size

Our pearls are available in four sizes: 7.0 mm, 7.5 mm, 8.0 mm and 8.5 mm. Larger Akoya pearls are rarer and therefore more valuable.

(Depending on the item, certain pearl sizes may not be available.)

Pearl Size