Opal Is a Gemstone formed from silica and a rich amount of water it contains approx 3 to 21 percent as per weight but in the case of amorphous character range goes to 6 to 10 percent. It is also called October birthstone and the name opal came from the Sanskrit word Upala meaning of Upala is ‘jewel’. Opal is Unique, Beautiful, found in multiple colors and shapes this gem is the most diverse among all gemstones.

https://www.rananjayexports.com/gemstones/opal