Gemology and Jewellery


The field reality

In the field, close to the mines (Ratnapura, Luc Yen …) and / or on the gem trading markets (Chanthaburi, Chiang Mai …), the gemologist must be able to buy his gems quickly. For this, its main identification tool is the magnifying glass.

Purchases made, back to the hotel or in his workshop, the gemologist can confirm his purchases using his gemological tools.

Five instruments are at his disposal:
– the magnifying loupe (magnifying x10, aplanatic and achromatic)
– the refractometer
– the polariscope
– the dichroscope
– the spectroscope

The dichroscope immediately identifies a dichroic or trichoic gem. (Cordierite versus amethyst, ruby ​​versus spinel …). The polariscope makes it possible to separate the isotropic stones from the anisotropic stones. (Glass versus Quartz). In any case, these two tools do not replace a spectrometric analysis.

A spectroscope not so used but why? 

In 80% of cases, the magnifying glass and refractometer analysis makes it possible to qualify the gemstone quite accurately.

The spectroscopic analysis is necessary for all the gems having a refractive index greater than 1.80 where the refractometer becomes inoperative (out of scale because higher than the refractive index of the contact liquid – polyunsaturated diiodomethane).
Examples include: demantoid garnet, zircon, synthetic zirconium oxide, titanite …

However, for gems with an index less than 1.80, gemologists tend not to use the spectroscope because its use until recently was relatively complex.

This for several reasons:
– Positioning, maintaining the gem on the spectroscope while bringing it to the eye to perform the analysis
– Difficulty of interpretation of the spectrum of the gem according to the source of non-natural lighting. (Ex: Blue LED inside that alters the analysis on certain wavelengths)
– Difficulty reading the spectrum on the spectroscope according to the parasites of the environment (glasses, colors of the environment)
– Difficulty comparing the spectrum displayed in the spectroscope with the bible of spectra of gems on paper

GoSpectro : The GoyaLab handheld spectrometer

GoyaLab through the development of GoSpectro offers the global community of gemologists to make the spectroscopy and finesse of its analysis accessible to all.

Thanks to the power of the GoSpectro smartphone spectrometer, the field gemmologist can:
– Immediately obtain a first qualification of the gem by comparing the current measurement to a database of reference gems. Ex: immediate identification of a ruby ​​or tanzanite. * Note1
– A unique objective analysis of the spectrum of the gem being measured
– Hands free analysis of gems
– Collaborative sharing of spectra of gems with his colleagues, his community

>>> See tests about the gems authentication with the GoSpectro

GemSpectr : the new application dedicated to gemology

This unique new application brings a new dimension to the study of precious stones.Effectively, you can finally compare two spectrums in real time. That, of your stone and that of a database. Indeed, the latter includes the spectra of the most common stones such as synthetic Ruby, Apatite, Zircon and many others. With just a GoSpectro, a smartphone and the GemSpectr app, rediscover gemology.

* Note1: Exceptions regarding the qualification of the gem remain on gems that do not have spectrum (Garnet andradite, Hessonite, Brazilianite, Andesine …).