In stock
1 kg induction melting furnace for retail jewellers — full charge to pour in minutes, with set-and-hold temperature control.
Melting capacity1 kg (gold)
USD 1,950
In stock
Diamond Tester
Handheld thermal-conductivity probe that separates diamond from common simulants at the counter.
USD 100
Price as of 9 September 2026
Catalogue enquiry · No online payment · Delivery and installation worldwide
At a glance
- Reads in about one second, with an LED scale and an audible tone
- Retractable tip works on stones still set in a mount
- Runs on a single 9 V battery — no bench supply needed
About the Diamond Tester
The Diamond Tester — also called the Vortex diamond tester, or a diamond tester pen — is a pocket instrument for the moment a customer puts a stone on the counter and asks what it is. It measures how quickly heat moves away from the tip: diamond conducts heat far faster than glass, cubic zirconia or white sapphire, and the meter reads the difference in about a second.
It is a sorting tool, not an assay. It will tell you confidently that a stone is not cubic zirconia, and it will not tell you a stone's clarity, colour or origin. Moissanite conducts heat close enough to diamond that a thermal probe alone cannot separate the two — a combined thermal and electrical tester is the usual answer where moissanite is common.
The probe suits a retail counter, a buy-back desk or a repair bench where stones arrive set and cannot be removed for a laboratory test.
Specifications
| Technique | Thermal conductivity |
|---|---|
| Separates | Diamond from cubic zirconia, glass, white sapphire and most simulants |
| Reading time | About 1 second, after a 30 second warm-up |
| Minimum stone size | 0.02 ct |
| Probe tip diameter | 0.6 mm, spring loaded |
| Indication | Eight-segment LED scale with audible tone |
| Power supply | One 9 V alkaline battery |
| Warranty | 12 months |
Specifications are subject to change. Confirm the current build with us before ordering.
Diamond Tester — questions
Will it tell moissanite from diamond?
No. Moissanite conducts heat closely enough to diamond that a thermal probe alone cannot separate them. If you see moissanite regularly, use a combined thermal and electrical tester, which adds a conductivity check that does distinguish the two.
Can I test a stone without unsetting it?
Yes — that is the point of the retractable tip. Hold the stone steady, touch the tip flat to the table facet, and take two or three readings at different points. Readings taken at an angle or on a dirty surface are the usual cause of an inconsistent result.
Does it grade the stone?
No. It answers one question: is this diamond or a common simulant. It says nothing about clarity, colour, cut or whether a stone is natural or laboratory grown, all of which need laboratory equipment.
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Talk to us
Ask a question before you buy
Tell us your shop size, your power supply and what you melt or test in a day. We will tell you which machine fits — including when the answer is the cheaper one.
- Showroom
- 7425 Jefferson AvenueMoreno Valley, CAUnited States
- Hours
- Monday – Saturday: 10:00–19:00Sunday: Closed
Diamond Tester
USD 100