Global Gemology - Rare Gems & Jewels
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"O" - JEWELER DIRECTORY

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Below is an alphabetized list of jewelry designers and manufacturers, along with photos of their corresponding maker's marks.

Click to enlarge each image.


Photos courtesy of Scott Papper, GIA GG, AJP, CM (NAJA), Global Gemology & Appraisals

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O


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.
Jewelry hallmark of O.C. Tanner Jewelry Co.
O.C. Tanner

ODELIA
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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.
Jewelry hallmark of Odelia Jewelry
Odelia

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.
Hallmark for Swiss luxury watchmaker, Omega Ω.
Omega Watch Co.
Hallmark for Swiss luxury watchmaker, Omega Ω.
Omega Watch Co.

ORIENTAL CULTURED PEARL CO.
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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.
Jewelry hallmark of Oriental Cultured Pearl Co. (OCP)
Oriental Cultured Pearl Co.

ORIGINAL DESIGNS
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Hallmark(s):  "ODI"
Information:  Original Designs, Inc. was founded in 1985.  Works in silver and gold.
Jewelry hallmark of Original Designs, Inc.
Original Designs

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.
Jewelry hallmark of OroAmerica
OroAmerica

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.
Jewelry hallmark of Navajo silversmith, Orville Tsinnie
Orville Tsinnie

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.
Jewelry hallmark of the famous Oscar Heyman & Bros. (HB)
Oscar Heyman & Bros.

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.
Jewelry hallmark of OTC International
OTC International
Jewelry hallmark of OTC International
OTC International
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  • HOME
  • ABOUT
  • SHOP
  • SERVICES
    • APPRAISALS
    • EXPERT WITNESS TESTIMONY
    • SELL YOUR JEWELRY
  • GEMOLOGY
    • GEM ENCYCLOPEDIA
    • THE ART OF GEMOLOGY
  • JEWELRY EDUCATION
    • DIAMOND FACTS
    • JEWELER DIRECTORY
    • JEWELRY PERIODS
    • POCKET WATCHES
    • NATIVE AMERICAN JEWELRY
  • GLOSSARY