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O.C. TANNER
Hallmark(s): "cTo" Information: O.C. Tanner Jewelry Co. was founded in 1927 by Obert Clark Tanner, in Salt Lake City, Utah. Works primarily in gold and platinum. |
O.C. Tanner
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ODELIA
Hallmark(s): "Odelia", "Odelia Creations" Information: Founded in 2000 as "A V Jewelry of New York" by Avi Matatov, in New York City, and later transitioned into "Odelia Diamond Jewelry". Works primarily in gold and platinum. |
Odelia
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OMEGA WATCH CO.
Hallmark(s): "Omega", "Omega Watch Co", "Ω" Information: Luxury watchmaker founded in 1903 by Louis Brandt, in Biel/Bienne, Switzerland. Omega was the first watch worn on the moon, in 1969. |
Omega Watch Co.
Omega Watch Co.
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ORIENTAL CULTURED PEARL CO.
Hallmark(s): "OCP", "Oriental Cultured Pearl" Information: The Oriental Cultured Pearl Co. was founded in the late 1950s/early 1960s by Otto Wolf in Chicago, Illinois. Worked primarily in gold and silver. |
Oriental Cultured Pearl Co.
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ORIGINAL DESIGNS
Hallmark(s): "ODI" Information: Original Designs, Inc. was founded in 1985. Works in silver and gold. |
Original Designs
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OROAMERICA
Hallmark(s): "OR" inside circle, heart, or octagon Information: OroAmerica was founded in 1977 by Guy Benhamou and Gianfranco Prioa, in Burbank, California. OroAmerica was later purchased by Aurafin, of Ft. Lauderdale, Florida. Worked primarily in gold. |
OroAmerica
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ORVILLE TSINNIE
Hallmark(s): "Orville Tsinnie of New Mexico", "Tsinnie" Information: Orville Tsinnie was a self-taught, Navajo silversmith who began his career in 1970, in New Mexico. After a 40+ year career, he was considered a Master Goldsmith, having won a Lifetime Achievement Award from the IACA. |
Orville Tsinnie
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OSCAR HEYMAN & BROS.
Hallmark(s): "HB" Information: Born in Russia, growing up in the Fabergé workshop, Oscar and his brother, Nathan Heyman, learned invaluable techniques working in platinum and gold. Oscar Heyman & Bros. was founded in 1912 after moving to America to avoid military service. They produced top tier jewelry for retailers such as Tiffany & Co., Cartier, Van Cleef & Arpels, and others. |
Oscar Heyman & Bros.
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OSTBY & BARTON
Hallmark(s): "O.B.", "O-B", "OB" Information: Ostby & Barton Jewelry Co. was founded in 1879 by Englehart Cornelius Ostby & Nathan B. Barton, in Providence, Rhode Island. In 1912, Otsby passed away on the Titanic. Worked primarily in gold. |
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OTC INTERNATIONAL
Hallmark(s): "OTC" Information: OTC International was founded in 1977, in New York City. Works primarily in gold and silver. |
OTC International
OTC International
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