Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and
Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and
Fast Delivery
Free returns
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Returns
Returns
We accept returns within 30 days of delivery. Items must be unworn, unwashed, and returned with original tags attached.
Care Instructions
Care Instructions
To preserve the beauty of your dress, we recommend gentle hand washing or dry cleaning. Do not bleach. Hang or lay flat to dry. Steam or iron on low heat if needed.
Shipping
Shipping
Orders are processed within 1–3 business days.
- Standard Shipping: 5–9 business days — $3.95
- Express Shipping: 4–7 business days — $9.95
Delivery times are estimates and may vary depending on your location. Tracking information will be provided once your order has been shipped.
Ensure the authenticity of your gemstones with the STONEGO Thermal Conductor Diamond Pen Hardness Tester. This portable and user-friendly tool is designed to accurately distinguish real diamonds, jadeite, and jade from imitations, making it an essential device for jewelers, collectors, and gemstone enthusiasts.
Key Features:
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High-Precision Thermal Conductivity Testing: Utilizes advanced thermal conductivity measurements to identify genuine diamonds and jade, ensuring reliable results.
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Audible and Visual Indicators: Features an LCD display and LED indicators that provide clear visual cues, while audible sounds confirm the authenticity of the tested stone.
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Metal Alert Function: Emits a continuous buzzing sound if the probe contacts metal, preventing false readings and ensuring accurate testing.
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Adjustable Testing Modes: Equipped with large/small switches to accommodate diamonds of varying sizes, enhancing versatility.
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Portable and Durable Design: Compact dimensions (1354023mm) and lightweight construction make it easy to carry, while the sturdy metal and plastic build ensures longevity.
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Battery-Powered Convenience: Operates on a single 9V battery (not included), allowing for on-the-go testing without the need for external power sources.
Operating Instructions:
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Power On: Insert a 9V battery and switch on the device. The power indicator light will illuminate, indicating the start of the preheating process.
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Prepare the Gemstone: Place loose stones on the provided support tray. For mounted stones, hold the jewelry securely by hand.
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Conduct the Test: Remove the needle sheath and hold the device, ensuring your index finger touches the conductive plate on the back. Gently place the probe vertically onto the gemstone's surface.
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Interpret Results:
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Real Diamond: The device will emit a beeping sound, and the LED indicators will progress to the green zone.
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Fake Stone (e.g., Cubic Zirconia): No sound or LED progression will occur.
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Metal Contact: A continuous buzzing sound will alert you to metal contact, prompting repositioning of the probe.
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Ideal For:
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Jewelers and Appraisers: Quickly verify the authenticity of diamonds and jadeite in various settings.
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Gemstone Collectors: Ensure the quality and authenticity of your collection with confidence.
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Retail and Pawn Shops: Provide immediate verification for customers and assess the value of items accurately.
Invest in the STONEGO Thermal Conductor Diamond Pen Hardness Tester to confidently assess the authenticity of your precious stones with precision and ease.

what our customers say about us
4.9
Based on 100+ Reviews
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EEmily R.Verified BuyerPerfect for a summer weddingI wore this to my cousin's wedding and felt amazing all day. The fit was exactly as expected, and I received so many compliments. I ordered my usual size S.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 23 2
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OOlivia H.Verified BuyerBeautiful dressReally happy with this purchase. I only wish I had steamed it before trying it on because it arrived with a few wrinkles from shipping.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0
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SSarah T.Verified BuyerSo flatteringI have a hard time finding dresses that fit my waist properly, but this one was perfect. Very comfortable to wear for several hours.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0
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CChloe W.Verified BuyerWorth every dollarThe quality surprised me. The material has a nice weight and doesn't feel see-through at all. I'll definitely order another style.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0
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AAmanda K.Verified BuyerEngagement photo approvedBought this for our engagement photos and couldn't be happier. It looked beautiful in natural light and fit perfectly.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0
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NNicole B.Verified BuyerRuns slightly roomyI was between sizes and ordered the larger one. It still looked great, but I probably could have gone with my usual size.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0
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HHannah C.Verified BuyerComfortable all eveningWore this to a formal dinner and didn't have to adjust it once. It stayed comfortable from start to finish.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0
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MMegan L.Verified BuyerLove the qualityBeautiful stitching and a really elegant design. It feels much more expensive than it actually is.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0
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RRachel S.Verified BuyerTrue to sizeI followed the size chart and ordered a Medium. It fit exactly the way I wanted.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0
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AAshley D.Verified BuyerReceived so many complimentsEveryone kept asking where I bought this dress. It's simple, elegant, and easy to accessorize.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0
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LLauren P.Verified BuyerVacation favoritePacked this for my trip to Italy and wore it twice. It's lightweight, comfortable, and photographs beautifully.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0
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BBrittany G.Verified BuyerLovely dressThe zipper was a little stiff the first time, but after wearing it once everything worked perfectly. Overall, I'm very happy.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0
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KKayla N.Verified BuyerHelpful customer serviceI wasn't sure which size to buy, so I contacted support first. They recommended a Small, and it fit perfectly.Diamond Tester Pen, High-Precision Thermal Conductivity Tool for Verifying Diamonds, Jadeite, and Was this helpful? 0 0