Yuriko, Princess Mikasa, the wife of Takahito, Prince Mikasa, the fourth son of Emperor Taishō and Empress Teimei. She is, therefore, a sister-in-law of Emperor Shōwa and an aunt of the present emperor, Akihito.
"Japan's Princess Kako attended an event at the Imperial Palace in December 2014 to celebrate her 20th birthday and her debut as an adult member of the imperial family. Emperor Akihito bestowed her with a decoration known as the Grand Cordon of the Order of the Precious Crown. Her tiara, necklace earrings, bracelet, and brooch, made by Mikimoto, are the new diamond parure given to the Princess on her 20th birthday." (Barb Smith's description) www.diamonds.pro