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+ lights & beep = real diamond

📏Compact 16x4x2.2cm, 100g lightweight

🔋9V battery powered, portable

KSh6037

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Sold byAmazon KenyaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💎 Don’t just guess—test and impress with instant gem authenticity!

USER FRIENDLY CALIBRATION - Simple glass calibration ensures flawless accuracy across diverse precious stones every time.
ERGONOMIC PORTABLE DESIGN - Lightweight pen-style tester fits perfectly in your toolkit or pocket for on-the-go verification.
MULTI GEM PRECISION TESTING - Accurately verifies diamonds, sapphires, rubies, jade, agate & more with calibrated light indicators.
PROFESSIONAL GRADE RELIABILITY - Trusted by jewelry pros and enthusiasts alike to confidently authenticate valuable gems.
INSTANT AUTHENTICITY CONFIRMATION - Beep and light signals provide immediate, reliable gemstone validation to avoid costly mistakes.

The JZK Portable Electronic Diamond Tester Pen is a compact, battery-powered device designed for quick and accurate testing of diamonds and multiple precious gemstones including sapphire, ruby, jade, agate, and crystal. Featuring a clear light and beep system, it instantly confirms authenticity with easy calibration and ergonomic handling, making it an essential tool for professionals and gemstone enthusiasts seeking reliable verification on the go.

Specifications

ASIN	B07DHPYLCV
Best Sellers Rank	11,480 in DIY & Tools ( See Top 100 in DIY & Tools ) 18 in Multi Testers 241 in Jewellery Accessories
Brand	JZK
Customer Reviews	4.0 4.0 out of 5 stars (2,836)
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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