- Size: Akoya pearl 7.5mm, both ears - Brand: TASAKI Thank you for viewing. The purchase certificate cannot be provided as it contains personal information. Please confirm the item's authenticity with the photos. Only sell to those who are satisfied with everything. The item will be shipped as is. Explanation of the 750 stamp: 750 gold (Au750) is a stamp indicating that the gold purity is 75%, the same as 18 karat gold (K18). Au is the chemical symbol for gold, and 750 represents a percentage of 1000. The remaining 25% is mixed with other metals to improve durability and color. TASAKI prices are increasing year by year.