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- Copeland, Elizabeth
Country Era 1866-1957
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- Corbett & Bertolone Inc.
Country City New York NY
Era c.1934 c.1950, c.1943
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- Corbin, D.R.
Country City New York NY
Symbol cartouche, frame, lozenge, rhombus
Shape cartouche, frame, lozenge, rhombus
Era c.1896, c.1915
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- Corona Mfg. Co.
Country City New York NY
Era c.1950
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- Coronet Jewelry Mfg. Co. Inc.
Country City New York NY
Era c.1950
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- Cory & Bro., W.F.
Country City Newark NJ
Era c.1896, c.1915
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- Costan, R.L.
Country City Fort Worth TX
Era c.1915
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- Costello & Co., V.Z.
Country City Providence RI
Era c.1934
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- Cottle Co., S.
Country City New York NY
Era c.1896, c.1915
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- Couronne Jewelry Co.
Country City New York NY
Symbol crown
Era c.1950
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- Courvoisier, A.
Country City Chicago IL
Era c.1915
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- Cowan-M. Myers Inc, E.A.
Country City Boston MA
Symbol flower, wheel
Era c.1915
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- Cowan-Myers Co.
Country City Boston MA
Era c.1922
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- Cowdrill, Sidney
Country City Toronto ON
Era c.1922
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- Cowen & Malawista
Country City New York NY
Symbol cartouche, frame, oval, rectangle
Shape cartouche, frame, oval, rectangle
Era c.1915
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- Craft Co. Inc.
Country City Newark NJ
Era c.1950