26 décembre 2017
Lot 2023. The Official State Gemstone of California. Benitoite, Benitoite Gem Mine, San Benito County, California; weighing approximately 2.08 carats and measuring 8.18 x 6.76 x 4.94mm. Sold for US$ 35,000 (€29,528) inc. premium. Photo: Bonhams. Around the turn of the 19th Century, a prospector discovered a blue material that he believed to be sapphire. Examination by experts determined the new gem material to be an unknown mineral. In addition, it turned out that the new material represented a previously unknown... [Lire la suite]
02 septembre 2012
Benitoite: California State Gemstone Benitoite is a beautiful blue to blue-purple gemstone that is almost exclusively found in California.
15 août 2012
Benitoite and Neptunite