Sword Art Online: Asuna Blue Crystal Yui Heart Necklace This is a beautiful costume necklace from the popular anime series, Sword Art Online! The blue tear drop crystal pendant is just like that worn by Asuna in memory of the child Yui. This is perfect to complete a costume or wear everyday as a fan of the series! Dimension & Measurement: Chain approx. 18-inch Pendant approx. 1-inch Ball chain clasp