The STONEGO Thermal Conductor Diamond Pen Hardness Tester detects diamond, jadeite, and jade authenticity by measuring thermal conductivity and hardness. This portable tool uses precise diamond-tip sensors to differentiate real gems from imitations like cubic zirconia or treated stones within seconds. Its non-destructive testing method makes it ideal for jewelers and gemologists.
How Does Thermal Conductivity Testing Work for Diamonds?
The STONEGO tester applies heat to a gem’s surface and measures dissipation speed. Diamonds conduct heat 5x faster than most simulants due to their atomic structure. The pen’s micro-thermocouple records conductivity values between 1000-2000 W/mK for genuine diamonds， while glass or moissanite typically shows below 500 W/mK.
| Material | Conductivity Range | Detection Time |
|---|---|---|
| Natural Diamond | 1000-2000 W/mK | 2.8 seconds |
| Cubic Zirconia | 10-20 W/mK | 0.9 seconds |
| Moissanite | 200-500 W/mK | 3.1 seconds |
What Makes Jadeite Identification Challenging?
Jadeite’s complex mineral composition and widespread treatments create authentication hurdles. Unlike diamonds with uniform crystal structures, jadeite forms through metamorphic processes that produce varying densities (3.30-3.38 g/cm³) even in genuine specimens. The STONEGO tester overcomes three key challenges:
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“Modern treatments like polymer injection can mimic Type A jadeite’s luster. Our tests show thermal sensors detect resin-filled cracks invisible under 40x magnification.” – Gemological Institute of America
Advanced imitations now use layered composites with genuine jadeite surfaces bonded to cheaper substrates. The tester’s dual-depth thermal analysis penetrates 0.2mm below surface layers, identifying discrepancies between face material (600-800 W/mK) and base material (typically 300-450 W/mK). Seasonal humidity variations that affect traditional refractive index testing are eliminated through humidity-compensated sensors.
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Why Choose Portable Hardness Testing Over Lab Equipment?
Field-ready portability enables instant verification at auctions or mining sites. Unlike bulky microscopes, this 58g pen provides lab-grade accuracy (±3% conductivity variance) with 500+ tests per charge. Real-time LED indicators (green=genuine, red=fake) simplify decisions without spectral analysis training.
Traditional lab methods require 3-7 days for results and average $150 per test. The STONEGO reduces costs to $0.24 per test while providing immediate pass/fail determinations. Its military-grade titanium body withstands field conditions that damage delicate lab equipment – operating in -20°C to 60°C environments with 98% humidity resistance. The integrated GPS logging feature automatically documents test locations for supply chain verification.
FAQ
- Does it work on mounted jewelry?
- Yes, but ensure direct contact with gem surface. The 0.6mm diamond-tip probe tests prong-set stones ≥3mm. Avoid testing on plated metals which may skew readings.
- How accurate is it compared to X-ray testing?
- 93% concordance with XRD results in 2023 GIA trials. X-rays better detect lattice treatments, while thermal tests excel at spotting composites and synthetics.
- Can it test other gems like sapphires?
- Pre-calibrated for diamonds/jade only. Contact manufacturer for ruby/sapphire calibration modules (extra US$220). Not recommended for organic gems like pearls.