Can this test semi precious gemstones such as quartz, amazonite, lapis etc?

I always test a diamond first to calibrate it. A lot depends on the temperature in your room and the stone you are testing. Once it is set and your diamond goes into the red, then test your other stones. I have found that if it is a semi precious stone there will be a movement from your starting lights by maybe one or two sections. If however the stone you are testing is glass it doesn't move at all. Cubic zirconium also moves the light. It takes a few goes to find the right settings each time because of surrounding temperature. Sorry I can't help any further....I am still learning myself!

Can it identify natural Zircon

My understanding is that it will not specifically identify zircon but would tell you the stone in question was not glass, crystal or diamond. As it works on conductivity I would expect zircon to give a high reading but not as high as diamond.

What number is for emerald?

I don't know, but the best thing to do would be to find out using a known genuine emerald - someone you know will have one. But remember that apart from diamond, a particular value will only tell you the stone has conductive properties consistent with being an emerald - it would not be a definite identification.

Can it detect gold chains aswell?

No, it will not detect gold chains since it's a gemstone detector

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JZK Portable Electronic Diamond Tester Pen for Diamond, Sapphire, Ruby, Crystal, Agate, Jade, gems Multi Gemstone Precious Stones Hardness Test Tool, Diamond Selector II V2

JZK Portable Electronic Diamond Tester Pen for Diamond, Sapphire, Ruby, Crystal, Agate, Jade, gems Multi Gemstone Precious Stones Hardness Test Tool, Diamond Selector II V2

Product ID: 70328834

💡9+ indicator lights for precise gem ID

📏Compact 16x4x2.2cm size fits in your pocket

🔋Lightweight & portable, only 100g

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Description

💎 Don’t just wear gems—verify them like a pro!

USER FRIENDLY CALIBRATION - Easy probe calibration ensures accurate readings every time, even for non-experts.
MULTI GEMSTONE COMPATIBILITY - One tool tests a wide range of precious stones, eliminating guesswork and costly mistakes.
INSTANT GEMSTONE VERIFICATION - Quickly identify diamonds, sapphires, rubies, jade, and more with clear light & beep signals.
PORTABLE LIGHTWEIGHT DESIGN - Carry your diamond tester anywhere — sleek, compact, and ready for on-the-go authenticity checks.
PROFESSIONAL ACCURACY AT HOME - Trusted by experts and enthusiasts alike to validate jewelry with confidence and speed.

The JZK Portable Electronic Diamond Tester Pen is a compact, lightweight device designed for fast, accurate testing of diamonds and multiple gemstones including sapphire, ruby, jade, and crystal. Featuring 9+ indicator lights and audible beeps, it provides clear authenticity results. Its easy calibration and ergonomic design make it ideal for professionals and jewelry enthusiasts seeking reliable, on-the-spot gemstone verification.

Specifications

ASIN	B07DHPYLCV
Best Sellers Rank	12,398 in DIY & Tools ( See Top 100 in DIY & Tools ) 18 in Multi Testers 243 in Jewellery Accessories
Brand	JZK
Customer Reviews	4.0 4.0 out of 5 stars (2,786)
Date First Available	3 Jun. 2018
Item Weight	110 g
Material	Plastic
Model Number	76166
Package Dimensions	17.3 x 6.9 x 4.9 cm; 110 g

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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