"Corocraft" also more commonly known as Coro is a vintage jewelry line. It was a more moderately priced jewelry in comparison to others. Coro was made from 1901 to 1979 in the United States and 1998 in Canada. This jewelry line offered many unique high quality designs in brooches, necklaces, earrings and bracelets. A factory was established in Providence, Rhode Island in 1911.
There is a very long list of marks. Please see the list on this website http://www.illusionjewels.com/costumejewelrymarkscoro.html to view all of them. Many many patents existed.
Here is an example of a Coro pair of earrings:
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Julia C. Collecting
Costume Jewelry 202: The Basics of Dating Jewelry 1935-1980 : Identification and
Paducah, KY: Collector, 2007. Print