The ancient Romans developed glass and faience bead technology, but, as with us, valued natural gem stones highly, due to their rarity and the labor involved in working them. That work was often done by slaves who spent hours polishing a single bead. Ancient Roman Blue glass charm dating to about 300-100 BC. Measures .61”(15.5mm) in diameter with a 4mm opening adorned with sterling silver grommets and mounted on a Sterling Silver 22” snake chain. Comes gift boxed with a certificate of authenticity. Makes a fine gift.