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Makers & Marks
Maker’s Marks
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Famous Jewelers
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Ancient To Roman
Medieval To Baroque
Georgian Jewelry
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Art Nouveau Jewelry
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Edwardian Jewelry
Art Deco Jewelry
Retro Jewelry
Fifties Jewelry
American Jewelry
Timeline
Jewelry Types
Rings
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Bracelets
Brooches & Pins
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Pendants
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Archaic Jewelry
Techniques,Materials & Motifs
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Index
Index
Image Gallery
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Gems & Gemology
Jewelry Gems
Diamonds
Famous Diamonds
Gemstone Cuts & Shapes
Gems, Minerals & Rocks
Synthetics, Simulants & Treatments
Gemological Terms, Tools & Properties
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Onyx Allure
May 29, 2025
The Unexpected Red Theory
April 23, 2025
Garnet: The Unsung Gem of Vintage Jewelry
March 21, 2025
Love ~ Victorian Style
February 7, 2025
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Shop at Lang
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Makers & Marks
Maker’s Marks
Jewelry Identification
Hallmarks
Famous Jewelers
Jewelry
Jewelry History
Ancient To Roman
Medieval To Baroque
Georgian Jewelry
Victorian Jewelry
Art Nouveau Jewelry
Arts & Crafts Jewelry
Edwardian Jewelry
Art Deco Jewelry
Retro Jewelry
Fifties Jewelry
American Jewelry
Timeline
Jewelry Types
Rings
Engagement Rings
Bracelets
Brooches & Pins
Earrings
Necklaces
Parures & Suites
Pendants
Hair & Head Ornaments
Gent’s Jewelry
Watches
Accessories
Archaic Jewelry
Techniques,Materials & Motifs
Techniques
Designs & Motifs
Settings
Materials
Findings
Tools
Index
Index
Image Gallery
Videos
Gems & Gemology
Jewelry Gems
Diamonds
Famous Diamonds
Gemstone Cuts & Shapes
Gems, Minerals & Rocks
Synthetics, Simulants & Treatments
Gemological Terms, Tools & Properties
Blog
Latest in Learn with Lang
Onyx Allure
May 29, 2025
The Unexpected Red Theory
April 23, 2025
Garnet: The Unsung Gem of Vintage Jewelry
March 21, 2025
Love ~ Victorian Style
February 7, 2025
Shop at Lang
Shop at Lang
Shop Georgian Jewelry
Shop Victorian Jewelry
Shop Art Nouveau Jewelry
Shop Edwardian Jewelry
Shop Art Deco Jewelry
Shop Retro Jewelry
Shop Mid-Century Jewelry
Shop Estate Jewelry
Home
Koch, Jonas Maker’s Mark
Koch, Jonas Maker’s Mark
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Makers & Marks
Maker’s Marks
Jewelry Identification
Hallmarks
Famous Jewelers
Jewelry
Jewelry History
Ancient To Roman
Medieval To Baroque
Georgian Jewelry
Victorian Jewelry
Art Nouveau Jewelry
Arts & Crafts Jewelry
Edwardian Jewelry
Art Deco Jewelry
Retro Jewelry
Fifties Jewelry
American Jewelry
Timeline
Jewelry Types
Rings
Engagement Rings
Bracelets
Brooches & Pins
Earrings
Necklaces
Parures & Suites
Pendants
Hair & Head Ornaments
Gent’s Jewelry
Watches
Accessories
Archaic Jewelry
Techniques,Materials & Motifs
Techniques
Designs & Motifs
Settings
Materials
Findings
Tools
Index
Index
Image Gallery
Videos
Gems & Gemology
Jewelry Gems
Diamonds
Famous Diamonds
Gemstone Cuts & Shapes
Gems, Minerals & Rocks
Synthetics, Simulants & Treatments
Gemological Terms, Tools & Properties
Blog
Shop at Lang
Shop at Lang
Shop Georgian Jewelry
Shop Victorian Jewelry
Shop Art Nouveau Jewelry
Shop Edwardian Jewelry
Shop Art Deco Jewelry
Shop Retro Jewelry
Shop Mid-Century Jewelry
Shop Estate Jewelry
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