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- Cornet, A.G.
Country City Breda
Symbol cartouche, frame, pillow, square
Shape cartouche, frame, pillow, square
Era early 20th century
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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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- Coudenhove-Kallergis, Anita
Country City Paris
Era (1898 – ?)
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- Coudray, Marie Alexandre Lucien
Country City Paris
Era b.1864
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- Coufal, Franz
Country Era 1867-1922
Symbol cartouche, frame, rectangle, v clipped
Shape cartouche, frame, rectangle, v clipped
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- Couronne Jewelry Co.
Country City New York NY
Symbol crown
Era c.1950
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- Courthope, Frederick
Country Era fl.1885-1915
Symbol cartouche, frame, quatrefoil
Shape cartouche, frame
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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