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

📏Portable 16x4x2.2cm sleek design

🔋Compact 100g, powered by 1x 9V battery

£22.55

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Description

💎 Test Like a Pro, Shine with Confidence!

INSTANT CONFIDENCE - Real-time light & sound feedback eliminates guesswork, empowering smart jewelry decisions.
MULTI GEM PRECISION - Accurately verifies diamonds, sapphires, rubies, jade & more with distinct light & beep signals.
PORTABLE LIGHTWEIGHT - Compact pen-sized tester fits perfectly in your toolkit or pocket for on-the-go authenticity checks.
USER FRIENDLY CALIBRATION - Easy probe calibration on glass ensures flawless readings every time.
PROFESSIONAL GRADE AT HOME - Trusted by experts, now accessible for personal use—never get duped by fake gems again.

The JZK Portable Electronic Diamond Tester Pen is a lightweight, battery-powered device designed to accurately identify real diamonds and multiple other precious gemstones through a unique light and beep system. Its compact size and easy calibration make it ideal for professionals and enthusiasts alike, providing instant, reliable authenticity verification for diamonds, sapphires, rubies, jade, and more.

Specifications

ASIN	B07DHPYLCV
Best Sellers Rank	11,772 in DIY & Tools ( See Top 100 in DIY & Tools ) 17 in Multi Testers 241 in Jewellery Accessories
Brand	JZK
Customer Reviews	4.0 4.0 out of 5 stars (2,841)
Date First Available	3 Jun. 2018
Guaranteed software updates until	unknown
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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