Gemmo: Gold Calculator & Scan
Jewelry Identifier & Appraisal
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Free
In-App Purchases
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About
What's that ring really worth? Snap a photo and find out in seconds.
Gemmo identifies your jewelry, decodes the tiny hallmark stamp, and estimates its melt value from live precious-metal prices — then tells you, honestly, whether it's likely real.
WHAT GEMMO DOES
• Identify any piece — rings, necklaces, bracelets, earrings, brooches
• Decode hallmarks — 14K, 18K, 750, 925, PT950 and maker's marks, explained in plain language
• Estimate value — melt value from live gold, silver and platinum spot prices, shown as a realistic range
• Real or fake — an honest authenticity read plus at-home tests you can do yourself
• Jewelry Box — save every scan, track your collection's total value, and export an insurance/inventory PDF
MACRO HALLMARK SCANNER
A dedicated close-up camera mode tuned for the tiny engraved stamps inside rings and clasps — the detail that reveals the metal and purity.
HONEST BY DESIGN
A photo can't assay metal or certify a diamond, so Gemmo never pretends to. You get verifiable hallmark decoding and a real melt-value number, with clear confidence levels and at-home tests — guidance, not a certified appraisal.
Perfect for inherited jewelry, estate and thrift finds, or simply knowing what's in your drawer.
GEMMO PREMIUM
Gemmo is free to try — three scans, no account needed. Premium unlocks unlimited scans, live melt values and insurance PDF export.
• Weekly — $5.99 per week, after a 3-day free trial
• Yearly — $39.99 per year
Prices vary by country and are shown in your own currency before you buy. Payment is charged to your Apple Account at confirmation of purchase. A subscription renews automatically unless auto-renew is switched off at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours before the period ends. Manage or cancel your subscription in your Apple Account settings after purchase. Any unused portion of a free trial is forfeited when you buy a subscription.
Terms of Use: https://www.gemmo.app/terms
Privacy Policy: https://www.gemmo.app/privacy
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What's New in Gemmo
1.2
September 26, 2026
New: Offer check. Selling a piece? Type in what a buyer offered and Gemmo shows how it compares with the piece's melt value — and the least you should ask for — before you say yes. Part of Gemmo Premium. Also in this update: • A cancel button while a scan is running. • "Scan another" now respects your free scans, and restoring purchases tells you what it found. • Clearer text and controls in light mode, and the purity scale no longer clips at 24K. • If a PDF export ever fails, Gemmo now tells you instead of doing nothing.
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Subscriptions & In-App Purchases
Unlimited access
Unlimited access
$5.997 Days
3 Days trial
