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Top rated jewelry diamond testers

AI-generated summary · updated July 28, 2026 · verify details before purchase.

  1. GemOro GIA Diamond Tester 2
    Best overall GemOro

    GemOro GIA Diamond Tester 2

    4.7/5 $249.95

    Accurate thermal conductivity tester with quick response and easy-to-read LCD.

    • Fast reading
    • Reliable accuracy
    • Limited to diamonds
  2. Presidium Diamond Mate
    Best budget pick Presidium

    Presidium Diamond Mate

    4.5/5 $149.00

    Affordable handheld tester with dual-mode detection for diamonds and moissanite.

    • Low price
    • Dual-mode
    • Short battery life
  3. Diamond Selector by The Diamond Pro
    Best for hobbyists GemTrue

    Diamond Selector by The Diamond Pro

    4.3/5 $365.00 Only 2 left

    User-friendly tester with audible alerts and automatic shutoff.

    • Audible alerts
    • Auto shutoff
    • Plastic housing
  4. Best for professionals

    Schnell Diamond Pro

    4.4/5 $120-$150

    Professional-grade thermal and electrical conductivity tester with high precision.

    • High precision
    • Dual conductivity
    • Higher cost
  5. Best value

    DiamondCheck Pro

    4.6/5 $80-$100

    Combines thermal and UV detection for reliable identification of diamonds and simulants.

    • UV detection
    • Solid build
    • Occasional false positives
  6. Crown Diamond Tester
    Best entry-level Siziviki

    Crown Diamond Tester

    4.2/5 $9.99

    Simple, no-frills tester ideal for beginners and occasional use.

    • Easy use
    • Compact
    • No moissanite mode
  7. Best for detailed analysis

    DiamondScope Pro

    4.1/5 $150-$200

    Advanced spectroscopic tester offering detailed material analysis beyond diamonds.

    • Spectroscopic analysis
    • Broad material range
    • Complex interface
    • Expensive
  8. JewelMate Diamond Tester
    Best low-cost option Presidium

    JewelMate Diamond Tester

    4.0/5 $289.00 Only 20 left

    Basic thermal tester suitable for quick checks in a retail setting.

    • Very cheap
    • Simple
    • Limited features
    • Short lifespan

Buying advice

When choosing a diamond tester consider the detection method (thermal vs. electrical vs. spectroscopic), battery life, and whether you need moissanite detection. Budget-friendly models cover basic needs, while professional units offer dual-mode testing and higher accuracy for frequent use.

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