Independent Gemological Appraisers Worldwide

To conduct valuable research, we use a variety of instruments
Have a look at the equipment we use during our analysis


GemmoRaman-532 is an invaluable instrument for fast identification. Non destructive tool for gems. While its main purpose is material identification, it has numerous applications for separating synthetic materials, detecting treatments and colour enhancements.

FT-IR Spectrometer

FT-IR Spectrometer is used for diamond analysis, knowing what type of diamond and manipulations as well as for other precious stones.
FT-IR stands for Fourier Transform InfraRed, the preferred method of infrared spectroscopy. In infrared spectroscopy, IR radiation is passed through a sample. Some of the infrared radiation is absorbed by the sample and some of it is passed through (transmitted). The resulting spectrum represents the molecular absorption and transmission, creating a molecular fingerprint of the sample. Like a fingerprint no two unique molecular structures produce the same infrared spectrum. This makes infrared spectroscopy useful for several types of analysis. Each precious stone is different, also synthetic and manipulated stones can be detected.

UV-VIS spectrophotometer

Gemosphere Magilab UV-VIS spectrophotometer. Automatic UV-Vis-NIR spectrometer with high quality integrating sphere for testing diamonds and gemstones. GemmoSphere records gemstone’s absorbtion spectrum at near-UV, visible and near-infrared wavelengts. It’s main purpose is for verifying natural origin of colorless diamonds, but this technology is also widely used in other areas, such as for testing fancy colored diamonds, sapphires, emerald, spinel, tourmaline and jadeite. GemmoSphere™ works with the same familiar software as other MAGILABS products, provided with it’s own growing UV-Vis-NIR – libraries.


“Avantes” spectroscopy in UV/VIS allows to have a spectrum from 180 to 1100. From Ultra-violet till near infra-red. Most of the gemstones can be analyzed and most of the manipulations and syntheses are discovered.
Optical spectroscopy is a technique for measuring light intensity in the ultraviolet, visible, near-infrared, and infrared wavelength ranges. It studies the absorption and emission of light and other radiation by matter. It also examines interactions between particles such as electrons, protons, and ions. Spectroscopic measurements are used in many applications, but also, for diamonds and gemstones.

SAS spectrophotometer

SAS spectrophotometer for diamonds.
Adamas Gemological Laboratory is proud to introduce to the industry the custom built SAS2000 Spectrophotometer Analysis System for diamond and gemstone evaluation and grading. The SAS2000 provides color grading, helps determine radiation treatments of diamond.

Xray analyzer

Xray analyzer for precious stones and pearls. The distinction of natural from cultured pearls and gemstones traditionally has been based on X-radiography. Using this technique, we can observe in a selection of natural pearls and beaded and non-beaded cultured pearls. These observations is shown to be a powerful tool for pearl and gemstones identification.

XRF Precious metal analyzer

XRF Precious metal analyzer. A solution for chemical analysis of metals and minerals, X-ray fluorescence (XRF) analysis offers both qualitative and quantitative insights into the elemental composition of samples (from traces to % levels) based on their unique XRF spectra. These spectra can be read in the field for instant elemental analysis using handheld XRF analyzers. Handheld XRF is a tried-and-tested tool for applications requiring immediate feedback such as precious metals analysis.

Zeiss microscope

Zeiss microscope analyzing till 1500X for pearls and precious stones. Sometime we must go to bigger enlargement. To see the “skin”.

Diamond Colorimeter

Diamond Colorimeter for color graduation for polished and rough diamonds. The diamond color we’ll be showing how these colors actually look as they are graded and compared side by side to other colors in the lab environment. The traditional way of grading color was to simply take the diamond in question and lay it alongside a known set of master colors, comparing them side by side in daylight fluorescent lighting (northern daylight) to determine their color grade. While this is the method still utilized in the labs today there have been some companies that have introduced technologies that will digitally measure the color of diamond and calibrate the machines to GIA standards. On round brilliant cuts it works so well that we employ such technologies when we’re double checking diamonds that arrive in our lab to consider for analyse.

Geiger counter

The Geiger counter can detect if the stone is radioactive. Some stones have been irradiated. A Geiger counter (also known as a Geiger–Müller counter) is an electronic instrument used for detecting and measuring ionizing radiation. It is widely used in applications such as radiation dosimetry, radiological protection, experimental physics and the nuclear industry. It detects ionizing radiation such as alpha particles, beta particles, and gamma rays using the ionization effect produced in a Geiger–Müller tube, which gives its name to the instrument. In wide and prominent use as a hand-held radiation survey instrument, it is perhaps one of the world’s best-known detection instruments. Used for irradiated diamonds and precious stones.


D-Screen from HRD for detecting synthetic diamonds. The D-Screen is a practical research device developed by WTOCD and HRD Research. It distinguishes stones that are not synthetic and have not been HPHT colour enhanced from stones that are potentially synthetic or may have had their colour improved by means of HPHT.

Hydrostatic Scale

Hydrostatic Scale for measuring the specific gravity of precious stones.
Specific gravity (SG) is the ratio of a substance’s density to the density of a reference substance. The reference substance is nearly always distilled water, which has an SG value of 1. Anything with a specific gravity greater than 1 sinks and anything with a density less than 1 floats. Specific gravity is commonly used to find the density or concentration of materials such as minerals and precious stones. We use the formula weight minus weight in distilled water. The original weight divided by the differences.

Immersion microscope

Immersion microscope used for detecting inclusions in precious stones. In gemmology, they are used for determining and checking gemstones; in the horizontal structure, they are used specifically for investigations in immersion liquids. The microscope needs not only to have enough power to be able to see flaws and inclusions in a stone, but also features that accommodate viewing gemstones of all shapes and sizes with ease. Thanks to the study of inclusions it is possible to determine the origin of the stone and the possible manipulations undergone.

Polarisation microscope

Polarisation microscope to study diamonds (stress) and the kind of precious stones. The GIA Polariscope is used to test the optical properties of gemstones and determine whether a stone is singly refractive, doubly refractive or is an aggregate. Doubly refractive stones may be divided further as to whether they are uniaxial or biaxial.

Goya Raman spectrometer

Goya Raman spectrometer with green laser for analyzing diamonds and precious stones.
Raman spectroscopy (named after Indian physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. Raman spectroscopy is commonly used in chemistry to provide a structural fingerprint by which molecules can be identified.
But also, more and more used in gemmology for identification.
Raman spectroscopy relies upon inelastic scattering of photons, known as Raman scattering. A source of monochromatic light, from a green laser. The laser light interacts with molecular vibrations, phonons or other excitations in the system, resulting in the energy of the laser photons being shifted up or down. The shift in energy gives information about the vibrational modes in the system.
Typically, a sample is illuminated with a laser beam. Electromagnetic radiation from the illuminated spot is collected with a lens and sent through a monochromator. Elastic scattered radiation at the wavelength corresponding to the laser line (Rayleigh scattering) is filtered out by either a notch filter, edge pass filter, or a band pass filter, while the rest of the collected light is dispersed onto a detector.

carat scale

The carat scale is used for all polished precious stones. One carat is 0,20 gram, in international trading only since 1939. Before carat could be slightly different from country to country and even city to city.

Alfa Mirage Precious Metal Tester GKS 3000

The electronic specific weight scale allows the detection of precious metals and their alloy quickly and efficiently. Gold (Lo, K9, 10-24), platinum (Lo, Pt 600-1000), silver, white gold, purity percentage and density are shown. Measuring range: 0.01-3000g/Min weight: 10g Purity % is displayed at the same time with purity K(PT) Easy viewing with VFD display Selectable measuring time (5 modes) Calculative error tolerance value can be shown (SG).

Coating thickness measure

Coating thickness measure can discover gold coating from 1 micron and up till 3 micron. Used for example for plated gold. Gold plating comes in varying levels of quality, largely depending on the thickness and purity of the gold coating, the base metal used for the piece and the quality of craftsmanship. Once plated, it’s almost impossible to tell real gold from gold plated jewelry just by looking at it.

The World Of Color Communication System

Two years in development, this new color communication system, based on Munsell has over 1,400 colors in this master comparison book of colors. Each of 40 pages has its own unique overlay chart, developed by color scientists and adapted for use in the jewelry industry by our own team of experts. The transparent overlay chart gives the name of the color. Also included is a gem crown and supplemental book that will contain usage information along with extensive grading charts that will correlate the World of Color selections with the GemGuide pricing 1-10 grading scale. Now you can more accurately describe, grade, and price all colored gems. Photo of product shown is a rendering—not the actual product.

Heavy liquid

Heavy liquid is used to separate precious stone on the basis of their density. In the mineral and precious stones industry, heavy liquids are commonly used in the laboratory to separate the “light” minerals such as quartz and clay from the “heavy” minerals. The density used for this type of separation is about 2.85 g/mL, nearly three times the density of water, but for precious stones wen use 2,57 – 2,62 – 2,67 – 3,05 and 3,32 Thanks to tables we can find the name of the stone.


Diampen: used to separate synthetic-colored diamonds from natural. The light source is a strong UV short wave. The results are green cross or lines, so we can see if the stone is real.

Digital microscope

Digital microscope used for training, microscope is connected to a laptop and beamer, also can be used by Zoom. With this tool we can show on internet the quality of the gems stone, we can make good quality pictures for laboratory reports.


The Gemmeter give the type of stones by reflection.
Reflection is the amount of light that bounces off the surface of a gemstone and is returned to the eye. This is the “sparkle” of a gemstone. Refraction is how the gemstone bends the light in different directions, separating white light into its spectral colors.

GIA cabinet

GIA cabinet for color grading of diamonds and the florescence.
Used to determine the color of diamonds using master stones, the instrument eliminates parasitic rays such as sunlight or incandescent lamps. It uses a D65 “cold color” lamp. It also allows to control the fluorescence of the diamonds in the upper support.

Mizar electronic gold tester

Mizar electronic gold tester give the carat of gold.
The RS Mizar M24 gold tester precisely determines gold carat values equal to or greater than 9ct, 10ct, 12ct, 14ct, 16ct, 18ct, 20ct, 22ct, and 24ct. Distinguishes gold wash and flash from solid gold. Can also be used to distinguish gold plate from solid gold.
15-Gold scale in gram.

Magnetic Scale

Magnetic Scale used to detect iron in precious stones. Magnetic gems are attracted to a magnet because of the metals dissolved within them. The degree of attraction can be noted as weak, moderate, strong, drags or picks up. Many gems are not “magnetic”, meaning they are not attracted to a magnet, and these show an inert or diamagnetic response.

Master stones for diamond grading

The Master Stone is special diamonds used to define another diamond’s color during its grading process. The definition of the diamond’s color is a delicate and complex task. Simple gauges are incapable of providing the required level of accuracy – therefore Master Stones are customarily used for examination and comparison purposes. This comparison between the color of the examined diamond and that of the Master Stone is conducted against a white paper background (or any other white background that is non-florescent), and under D65 light. The grading is between D and Z. There are several criteria for a diamond to serve as a Master Stone: It must be round and have a clarity level of SI and above, weigh at least 70 points, and possess pre-defined proportions according to a special table. In addition, Master Stones must be colored according to color grading defined by the Gemological Institute of America (GIA).

Diamond scale

Diamond scale. Used for the weight of diamonds and precious stones with a accuracy of 0,001 carat. For the reason it must be in a closed glass cage.


Microscope to study inclusions in diamonds and precious stones.
In gemmology, an inclusion is a characteristic enclosed within a gemstone, or reaching its surface from the interior. Inclusions are one of the most important factors when it comes to gem valuation. In many gemstones, such as diamonds, inclusions affect the clarity of the gem, diminishing the value. In some gems, however, such as stars, the inclusion actually increases the value of the gem.

Trinocular microscope

Trinocular microscope for pictures of inclusions in precious stones. Allows you to photograph inclusions in gemstones for inclusion in reports.


Polariscope for study diamonds (stress) and kind of precious stones.


Refracotmeter and hand spectrometer for precious stones analyses.
Spectroscopy has long been used in gemology for the characterization and identification of gems. A spectroscope makes it possible to measure the wavelengths of white light absorbed by the material and thus to deduce information on the chemical nature of the objects measured.

Classic refractometer

Classic refractometer basic tool in gemlab. The Gemological refractometer is considered by many to be the most important of all gem testing instruments. The primary use of the refractometer is to measure the angle at which light traveling through the stone is bent or refracted. This is called Refractive Index (R.I.).


Scale for rough diamond go till 2500 carats.

different scales

small tools

Different small tools: Presidium Gem and Duo, for gem testing, and diamond simulant. Presidium synthetic diamond tester for testing if the diamond is natural. Presidium electronic refractometer can give higher index as the classic refractometer, used for diamond and imitations.


SSEF synthetic diamonds detector. This detector was the first one for detecting HPHT treated diamonds, still reliable.

small tools for survey work

Different small tools for survey work. Micrometer, moissonite tester and synthetic tester.

UV short and long waves

UV short and long waves for fluorescence detecting. In diamonds fluorescent stone have less value depending if it is faint, medium or strong. Once a mineral has been identified, its fluorescent color is sometimes used to identify its place of origin. Similarly, if an unidentified mineral from a certain locality glows a specific color, it can often be identified by the color of its fluorescence. Ruby and topaz are two of the most photoluminescent gemstones. They appear to glow subtly in indoor or outdoor lighting. Some of the glow you’re seeing is actually photons emitted from electrons in the gem.

Luminescentie spectroscopy

Luminescentie spectroscopy. PL (Photoluminescence Spectroscopy) uses a UV beam to capture light generated from a substance as it falls from the excited state to ground state when irradiated by a UV beam. By measuring the luminescence spectrum, it is possible to observe material imperfections and impurities.

portable scale

Specific gravity portable scale. For working on the field.