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Quality Control​

In the belief that earning our customers’ confidence in the quality and safety of TASAKI’s products is paramount to the enhancement of customer satisfaction, we are pursuing initiatives to maintain our high standards of quality and safety.

In our pearl farming operations, we conduct artificial spat production and continue to engage in research for the development of Akoya oysters that can withstand changing ocean conditions, including rising ocean temperatures, and grow beautiful pearls.＊1

The cultured pearls are graded by strict criteria, and only those pearls that have been graded as top class are sent out into the world as TASAKI jewellery.

Pearls are ranked by quality according to their nacre quality, luster, color, shape, and size. For diamonds, in addition to the 4Cs of carat, color, clarity and cut set by the GIA (Gemological Institute of America), which determine diamonds’ value, TASAKI has set its own criteria, including order of confirmation, methods for checking each facet, and matters to be checked, against which our diamonds are strictly evaluated. In doing so, we ensure that our diamonds that are graded in-house in this way achieve the same grades as from third-party appraisers in 100% of cases.

Our products are inspected against pre-set standards and specifications to ensure the same results even by different inspectors. Strength criteria are set for each part, such as claws on jewellery settings, chain clasps, and earring clips, and multiple tests are conducted from the perspectives of strength and safety, alongside external indications of quality.

To ensure that our customers can enjoy their purchased jewellery for many years to come, we have established systems that enable us to offer after-sales services at our stores both in Japan and overseas. We also offer a lifetime service of free restringing of our pearl necklaces.