This is man made cantera opals. The opal itself is a 100% natural mexican opal which is encapsulated in our patented rhyolite and resin mix. This piece is 20 x 15 x 8 mm. This is a unique and extremely beautiful cabochon that will enlight you next jewelry project. Each piece is hand crafted by skilled artisans to be a OOAK gemstone. We accept payments only thru paypal. Shipping is done thru registered mail. Expected delivery time is 21-27 business days (usually because most of the packages will go thru destination´s customes to be cleared). Shipping is done monday, wednesday and friday.