Absolutely a favorite bead! We have adapted it as a button in Poetry in Pearls. This special addition adds so much. Of course, it's hard to source and so we will run out on occasion. This newer shipment is slightly larger, but the same price! It's now 14-15mm rather than 13-14mm...Just a little difference, but still very special. Made in China from mussels placed in freshwater pools, the mollusk builds a nacré coating over a mother-of-pearl disc. The hole is then drilled later. Button Pearl may have imperfections in the nacré over 60% of its surface. Expect variations...they are not perfect!