Bort is a term for industrial grade diamonds BOUTON PEARL A bouton pearl (also called a blister pearl) is a pearl that developed attached to the inside of the mollusk's shell This type of pearl must be cut off the shell, and is therefore hemispherical (half a sphere) Because of their shape, blister pearls are mostly used for earrings
\Bort\, n Imperfect or coarse diamonds, or scraps left over from cutting other diamonds