19.3g, 1.75" bandwidth, size 6.25 to include a gap of 1". Artist hallmark on verso. Number 8 turquoise is highly sought after by collectors. It was discovered in 1925 and was named Number 8, since it is an 8 on the Mohs scale of mineral hardness. Most turquoise is 4 or 5 on the Mohs scale. Sam Patania's couture works are hand made by Sam Patania, continuing the Patania family tradition of distinctive collectible jewelry.