"Akoya luminous round" button 18 mm

Small round button in natural Akoya shell. 
It's a kind of pearly oyster. 
It is thin and slightly wavy, with pretty colors. 
It's the perfect button for a blouse for example.   Akoya buttons (natural pearly shell) Size: 18mm diameter Made in France Care instructions: Before pressing or dry cleaning your garment, it is best to unsew the buttons. 
If you put them in the washing machine, wrap them in household aluminum foil, wash the garment inside out to avoid shocks, do not soak, spin gently, hang out immediately.
 What is Akoya?: A type of oyster, it is a naturally iridescent and pearly shell found in Japan