Large Ethiopian opal bead necklaces are extremely rare and this one even more so because of its exceptional quality. There are 86 beads graduating from 8.3mm to an impressive 12.7mm in this vibrant, glowing 232 carat opal bead necklace. Although it is agreed that the source for the opal that the Roman’s regarded as the most valuable gem in the world is this material from Ethiopia, the ability of this resource to continue to produce is certainly limited. Today, the opportunity to acquire a necklace like this is very limited and will become near impossible as this resource is exhausted.