Galaxy opal
The Galaxy is the world's largest polished opal, certified by the Guinness Book of World Records in 1992.[1] It was found at the Boi Morto Mine in north eastern Brazil in 1976. It is today part of a private collection. The finished opal weighs approximately 3,749 carats, or 0.75 kg. It was carved from a grapefruit-sized piece of rough stone weighing 5,205 carats by Scott Cooley into a shape resembling a child's head. The weight of the finished stone was beyond the capacity of any gem measuring scale at the Gemological Institute of America and an approximation of its weight in carats had to be determined using a postal scale. The stone measures 14.0 x 10.2 x 4.1 cm (5-1/2 x 4 x 1-5/8 in).
See also
This article is issued from Wikipedia - version of the Wednesday, July 08, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.