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Expertise turquoise

Expertise turquoise is a procedure for determining its authenticity, quality and, consequently, market value. In the process of special gemological studies, a number of qualitative characteristics of the presented sample are determined - its shape, size, color, purity and perfection of cutting.

How is gemological examination carried out at the Moscow Gemological Center?

Gemological examination in the laboratory of the MGC is carried out in the presence of the client. The laboratory's clients are received by appointment, during which the client is allocated a certain amount of time in accordance with the volume of the proposed work.

The examination is carried out on a collegial basis in accordance with the regulations and methodology for conducting work approved in our organization.

The procedure for conducting examinations is based on the principle
"from simple to complex"

First a preliminary inspection of the product, insert or stone is carried out, then - weighing, measuring, describing the appearance.

Next, tests and determinations are carried out using the simplest gemological instruments - testers and detectors, and only then is the study carried out using more complex gemological equipment (optical, spectral and other types).

After the diagnostic study, the quality parameters of the gemstone are classified. In this case, all the work is carried out by experts independently of each other. And only if there is a discrepancy between the individual results are additional experts involved.

Why is turquoise expertise needed and what does it give?

Gemological expertise is most often required during pre-sale preparation, as well as before handing over a precious stone as collateral.

As a result of the examination, it is possible to determine:

The presence and degree of defects;
Sample of the stone material;
Does the sample meet regulatory requirements;
How much will turquoise cost if sold;
Is it whether turquoise is genuine. Nowadays, you can find an imitation or counterfeit made using modern technologies, which is visually indistinguishable from the original stone. Therefore, authenticity can only be confirmed by a specialist;
Determining the authenticity and quality of turquoise often makes it possible to avoid large financial losses. The cost of paying a specialist is much less than the amount of possible damage in the event of selling a piece of jewelry at a reduced price;
It should be noted that it is impossible to assess the quality of turquoise "by eye". Modern synthesis methods make it possible to obtain synthetic materials that can be distinguished from natural ones only with the help of special high-precision equipment.

Types and cost of preliminary examination

Depending on the customer's wishes, examination of precious stones may include various studies:

Primary (diagnostic)

oral 1 700 Р

Determination of the mineral type of stone or other insert material
Determination of the insert weight in carats for loose inserts
Determination of the nature of the insert origin (stone) - natural, synthetic or artificial
Identification of the presence/absence of refinement

Standard

from 2,700 Р

Determining the mineral type of stone or other insert material
Determining the estimated weight insert fixed in jewelry, in carats
Determining the nature of the insert (stone) - natural, synthetic or artificial
Identifying the fact of the presence/absence of refinement, its type and degree of impact on the cut stone
Determining quality characteristics according to ISO TR (GIA) standards

Extended

On request

Determining the mineral type of the stone or other material of the insert
Determining the estimated weight of the insert fixed in the jewelry item, in carats
Determination of the nature of the insert (stone) - natural, synthetic or artificial
Identification of the presence/absence of refinement, its type and degree of impact on the cut stone
Determination of quality characteristics according to the standards of STO MGC, ISO TR (GIA) and in accordance with GOST
Determination of the region of origin of natural stones, such as emerald, ruby, sapphire, etc. (only for unfastened stones)
Determination of additional individual characteristics of the stone by means of complex spectral research

The results of the examination are drawn up in accordance with the approved standards of the organization STO MGC, which take into account domestic and international practice of conducting diagnostic and classification examinations.