Ocean Inside An Opal: Opal is the national gemstone of Australia, which produces 97% of the world’s supply. The internal structure of precious opal makes it diffract light; depending on the conditions in which it formed it can take on many colors. Precious opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black. Officially known as Opal Butte opal, the beautiful gem below is owned by Inna Gem. It weighs 740 ct and measures 60 x 45 x 41 mm. When the light hits this opal it looks like an underwater scene from the ocean. For those interested, it is still available for purchase and you can contact them directly for inquiries.