By Spectra Fine Jewelry, New York
The Collector's Encyclopedia
of Fine Jewelry
Expert guides on signed vintage jewelry, precious stones, and collecting intelligence — written by dealers who buy and sell at Christie's, Sotheby's, and Bonhams every season.
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Brand Guides
Cartier, VCA, Bulgari, JAR, and 40+ signed houses — authentication, pricing, what to buy.
45 brand guides
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Stone Guides
Kashmir sapphire, Burma ruby, Colombian emerald, Paraíba tourmaline and more.
25 stone guides
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Era Guides
Art Deco, Retro, Edwardian, Victorian — how to identify, date, and value each period.
10 era guides
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Authenticate
Interactive checklists, hallmark guides, and photography guides for every major brand.
Free tools
Featured Guides
Shop Spectra's Curated Collection
Signed vintage jewelry, fancy color diamonds, and unheated sapphires — authenticated and available now.
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