search
  • Anmelden
    Konto eröffnen
  • Telefonservice in Englischer Sprache

    Zollfrei - nur USA & Kanada:
    1-800-464-1640

    International:
    +66-39303404

  • Sprache ändern
  • USD

Gemstone Testers

Wouldn't it be wonderful if there were a simple to use and inexpensive machine that anyone could use to reliably identify gemstones? One that could distinguish real gems from synthetics and tell you whether your green stone is an emerald, a peridot, a demantoid garnet or just a piece of glass. It would be especially nice if the machine could tell you whether the stone had been heat treated or irradiated. Of course, such a machine should be able to this without damaging the gemstone in any way.

Diamond Tester
Diamond Tester

Unfortunately such a machine doesn't yet exist, and perhaps it never will. But there have been interesting attempts to develop one. There are now some useful devices on the market, though not yet one that can replace the judgement of a trained gemologist using traditional tools.

The best attempt so far to design such a device is a diamond tester, which was first used to distinguish diamond from cubic zirconia. Newer versions of these testers can also identify synthetic moissanite.

Since these testers work reasonably well on diamonds, there have been attempts to apply the same technology to colored gemstones. They are somewhat useful, but have limitations. Nonetheless, they are starting to be adopted in the trade.

Duo Gemstone Tester
Duo Gemstone Tester

These devices work by testing for thermal conductivity of the material. Diamond is an unusual material, because it has an especially high thermal conductivity. In fact it conducts heat five times better than the next best heat conductor, silver. That's the reason behind one of the oldest tests for diamond. If you take a diamond at room temperature and touch it against your upper lip, it will feel icy cold. That's because the diamond is conducting heat away from your body.

Cubic zirconia has a much lower level of thermal conductivity than diamond, so it was relatively easy to develop a tester to tell them apart. But when moissanite first came on the market, it fooled all the thermal conductivity testers, since moissanite also conducts heat very well. A different test for electrical conductivity had to be incorporated into a new generation of diamond testers.

In the world of colored gemstones, current testers on the market can distinguish sapphire from tanzanite, iolite, spinel, citrine, topaz and tourmaline; and distinguish ruby from spinel and garnet. They can also separate emerald from jadeite and garnet; and distinguish topaz from aquamarine, amethyst and citrine. They can reliably tell you if your putative gemstone is glass, even if they can't always tell you what kind of gemstone it is. To date, no electronic tester even attempts to diagnose gem treatments. Gemologists have no reason yet to fear for their jobs.

  • Erstausgabe: July-24-2008
  • Zuletzt geändert: January-22-2019
  • © 2005-2021 GemSelect.com alle Rechte vorbehalten.
    Nachdruck (Text oder Grafik) ohne die ausdrückliche, schriftliche Zustimmung von GemSelect.com (SETT Company Ltd) ist streng verboten.
More Shapes
Beliebte Edelsteine
  • Saphir
  • Smaragd
  • Rubin
  • Aquamarin
  • Zirkon
  • Opal
  • Topas
  • Turmalin
  • Granat
  • Amethyst
  • Citrin
  • Tansanit
Alle Edelsteine (140)
A B C D E F G H I J K L M N O P Q R S T V Z
  • Achat
  • Achat-Geode
  • Actinolith Katzenauge
  • Almandin-Granat
  • Amazonit
  • Amethyst
  • Ametrin
  • Ammolith
  • Andalusit
  • Andesin Labradorit
  • Apatit
  • Apatit-Katzenauge
  • Aquamarin
  • Aquamarin-Katzenauge
  • Aventurin
  • Azurit-Druse
  • Beryll
  • Blutstein
  • Boulder-Opal
  • Cat's Eye Opal
  • Chalcedon
  • Charoit
  • Chromdiopsid
  • Chrysoberyll
  • Chrysokoll
  • Chrysopras
  • Citrin
  • Citrin mit Asterismus
  • Demantoid-Granat
  • Dendritischer-Achat
  • Diamant
  • Druzy Amethyst
  • Enstatit
  • Erdbeerquarz
  • Falkenauge
  • Farbwechselnde Edelsteine
  • Farbwechselnder Diaspor
  • Farbwechselnder Fluorit
  • Farbwechselnder Granat
  • Farbwechselnder Saphir
  • Feuerachat
  • Feueropal
  • Fluorit
  • Goldener Beryll
  • Granat
  • Grandidierite
  • Grossular Granat
  • Hemimorphit-Druse
  • Hessonit-Granat
  • Howlith
  • Hyalit Opal
  • Hämatit
  • Idokras
  • Imperial Topas
  • Iolith
  • Jade
  • Jade-Schmucksteine
  • Jaspis
  • Karneol
  • Katzenaugen Edelsteine
  • Klinohumit
  • Koralle
  • Korallen-Fossil
  • Kornerupin
  • Kunzit
  • Kyanit
  • Labradorit
  • Lapislazuli
  • Larimar
  • Malachit
  • Malaya-Granat
  • Mali-Granat
  • Mawsitsit
  • Mondstein
  • Mondstein Katzenauge
  • Morganit
  • Mystik Topas
  • Nuummit
  • Obsidian
  • Onyx
  • Opal
  • Opal in Matrix
  • Opal-Dublette
  • Peridot
  • Perle
  • Perlmutt
  • Pietersite
  • Prehnit
  • Pyrite
  • Pyrop-Granat
  • Quartz With Marcasite
  • Quarz
  • Quarz-Katzenauge
  • Regenbogen-Mondstein
  • Regenbogen-Pyrit
  • Rhodochrosit
  • Rhodolit-Granat
  • Rosenquarz
  • Rubellit-Turmalin
  • Rubin
  • Rubin in Fuchsit
  • Rubin-Zoisit
  • Rutilquarz
  • Saphir
  • Schneeflockenobsidian
  • Schokoladen Opal
  • Schwarzer Opal
  • Scolecite
  • Seraphinite
  • Serpentin
  • Sillimanit
  • Sillimanit-Katzenauge
  • Skapolith
  • Skapolith Katzenauge
  • Smaragd
  • Smithsonit
  • Sodalith
  • Sonnenstein
  • Spectrolite
  • Spessartin-Granat
  • Sphalerit
  • Sphen
  • Spinell
  • Stern-Edelsteine
  • Sterndiopsid
  • Sterngranat
  • Sternmondstein
  • Sternrosenquarz
  • Sternrubin
  • Sternsaphir
  • Sternsonnenstein
  • Tansanit
  • Tigerauge
  • Tigerauge Matrix
  • Topas
  • Tsavorit / Tsavolith
  • Turmalin
  • Türkis
  • Variscit
  • Zirkon
Hauptkategorien
  • Neuheiten
  • Schmucksteine Sets
  • Kalibrierte Edelsteine
  • Edelsteine nach Preisen
  • Erstklassige Edelsteine
  • Passende Paare
  • Cabochon Edelsteine
  • Drilled Gems, Briolettes and Beads
  • Geburtssteine
  • Schmuckstein-Schnitzereien
  • Fantasie Edelsteine
  • Stern-Edelsteine
  • Unbehandelte Saphire
Telefonservice in Englischer Sprache

Zollfrei - nur USA & Kanada:
1-800-464-1640

International:
+66-39303404

Sparen Sie Geld
Keine Versandkosten für zusätzliche Artikel!
8.90 $ Weltweiter Versand

Update Translation
 
Current Value
New Value
GemSelect Gemstones
X Fenster schließen
Colored Gemstones
X Fenster schließen
Colored Gemstones
X Fenster schließen
Colored Gemstones
Größe und Gewicht

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart