Our largest size of marble is 1" or 25mm, and we call them Whoppers! The Whopper sized jewelry will fit those old shooter marbles from your childhood. We only offer pendants in this size of interchangeable jewelry. The effect of the large sphere is astounding! 8 colors including transparent iridescent green & pink, an opaque iridescent gray, both opaque and translucent blues, two cats eye marbles, and one red swirl and an ocean blue swirl marble. Georgous!