At its widest point Cir. The inside end to end measures around 5"ΒΌ with an additional 1"? No marks but tested as sterling silver great addition to your collection The history of Wyoming jade (nephrite) is very short.
There are many urban legends that describe how Chinese railroad laborers discovered Wyoming jade in the late 1800s and sent this fine-grained nephrite back to China. Bob Frey conveyed to me that while he lived in Hong Kong he saw many Chinese jades, carved during the Victorian era, in shops that appeared to be carved from Wyoming jade. Jade, the Wyoming State gemstone, was first described in the Granite Mountains area of central Wyoming in 1936.
Much exploration followed right after the publication in February 1945. Of Popular Science containing a short article titled'Green Gold': How prospectors are finding a fortune in boulders of high-grade American green jade. The most intense jade exploration and mining activity occurred there between about 1940 and 1960. By the mid-1960s, beautiful green, inexpensive British Columbian nephrite came on the North American market and destroyed the more expensive Wyoming jades.