Note: Weight varies between 4.6 and 4.8 grams for subtypes Y#E13.1 and Y#E13.2, between 3.8 and 5.7 grams for Y#E13.3, and subtype Y#E13.4 weights 3.8 grams. Purity is unknown for all subtypes (though for cataloging purposes we use sterling silver .925)