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Go stones made from Swabute clamshells collected at Oguragahama Beach in Hyuga City, Miyazaki Prefecture, may have color stains on the shells due to the natural nature of the material.
Those with this color stain remaining in the finished Go stones are classified as Hyuga specialty "Hana-jirushi (Flower Grade)".
*Please check the phot images.
Size 33 clamshell Go stone should assure the thickness of 9.2mm, so its material clamshells must be thicker than 10.5mm. It is hard to collect big and thick Hyuga clamshells because they grow very slow in natural environment. Such thick clamshells are truly rare.
We highly recommend this product to those who are looking for rare Go stones.
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