JGTL Online Report Verification

Mini Report

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Full Report

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Advanced Scientific Report

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Diamond Scientific Report

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Jewelry Report

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Full Report Gemstones

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Standard Gemological Testing

Jade and Gems Testing Laboratory (JGTL) utilizes a wide array of gemological techniques to ensure precise gemstone testing include:

Refractive Index measurement of the gemstone's optical properties.

Specific Gravity determination of the gemstone's density relative to water.

Microscopic Observation detailed inspection of internal and external features, such as inclusions and surface characteristics.

Spectroscope examination of light absorption across the visible spectrum.

Polariscope identification of optical properties e.g. optic figures, optic signs.

Pleochroism observation of color variation when viewed from different angles.

Fluorescence analysis of the gemstone's reaction to ultraviolet light.

Advanced Spectroscopic Methods

JGTL lab employs spectroscopic analysis to provide more sophisticated examination of physical and chemical properties include:

Fourier-Transform Infrared Spectroscopy (FT-IR) identify gems identifications, treatments, types of diamond, and filling substances in gemstones.

UV-Vis-NIR Spectroscopy origin determination of corundum and emerald, causes of color in gemstones.

Raman Spectroscopy identify gemstone composition.

Energy Dispersive X-ray fluorescence (EDXRF) determine chemical composition of gemstones, identify trace elements and distinguish between natural and synthetic stones.

Ruby & Sapphires

NTE (None Thermally Enhanced) No Indications of heating or no evidence of heat treatment

TE (Thermally Enhanced) Indications of heating (with no residues)

H(a) Enhanced by heat with very small residues within fissures

H(b) Enhanced by heat with minor to moderate residues within fissures

H(Be) Enhanced by heat and light elements (e.g., beryllium)

H(HPHT) Enhanced by high pressure and high temperature

SD (Surface Diffusion) Color altered by surface diffusion

H(Lead/Bismuth) Enhanced by heat with residues of lead or bismuth-rich glass

Emerald

None or No clarity enhancement No indications of clarity enhancement / No fissure filling

Insignificant Indications of insignificant clarity enhancement (with oil or resin in fissures)

Minor Indications of minor clarity enhancement (with oil or resin in fissures)

Moderate Indications of moderate clarity enhancement (with oil or resin in fissures and cavities)

Jadeite (Fei-cui)

A-Jade No indications of polymer impregnation or dyeing.

B-Jade Indications of bleaching and polymer impregnation.

C-Jade Indications of dyeing.

B+C Jade Indications of dyeing after bleaching and polymer impregnation.

Other Gemstones

Irradiation Disclaimer The presence of color-enhancing irradiation cannot be scientifically verified in topaz, tourmaline, spodumene (kunzite), and quartz due to a lack of diagnostic gemological evidence.

Heating Disclaimer Conclusive proof of routine, low-temperature heating is impossible to detect in tanzanite, zircon, quartz, beryl (aquamarine), and tourmaline (including Paraiba-type) as it leaves no physical or structural traces.

Terms and Limitations

Clients must ensure that their gemstones are fully insured for their declared value during transport. JGTL lab recommends comprehensive all-risk insurance to cover any potential loss, damage, or theft.
JGTL lab is not liable for any loss or damage beyond the stated receipt amount for uninsured items. All transportation fees, customs duties, and associated costs are the client’s responsibility.
JGTL lab would mention the treatments that were detectable within the parameters of our analytical framework.
Each gemstone is treated as a new submission, and any subsequent rechecks, especially after modifications such as recutting or polishing, may yield different results due to changes in the gemstone’s structure or characteristics.
The absence of a specific treatment mention in the report does not conclusively imply that the gemstone has not undergone treatment. JGTL lab's reports are based solely on the findings at the time of examination.
The geographical provenance is mentioned as an expert opinion which derived from the observed physical and chemical attributes of the analyzed samples and the comparative data of known deposits.

Advanced Testing for Beryllium Diffusion

Beryllium (Be) Bulk-Diffusion Notice Beryllium (Be) bulk-diffusion in corundum (sapphire and ruby) cannot be conclusively identified using standard gemological testing or routine advanced spectroscopy. Detection of this treatment requires Laser-Induced Breakdown Spectroscopy (LIBS) or equivalent ultra-trace element analysis. Consequently, JGTL does not routinely screen for Beryllium diffusion. This specialized analysis is conducted only upon explicit client request and is subject to additional testing fees.

Jewelry & Mounted Gemstone Analysis Limitations

When testing gemstones that are submitted within a jewelry setting or mounting, the following specific conditions and limitations apply:

Setting Constraints Gemstones mounted in jewelry are tested and analyzed strictly within the limitations imposed by the setting. Optical and physical properties that require unhindered access to the stone may be restricted.

Sampling of Multiple Stones In jewelry items featuring multiple gemstones, the laboratory reserves the right to select representative stones at random for testing. The findings from these selected samples are inferred for the remainder, but do not guarantee identical properties for every untested stone in the piece.

Approximate Measurements and Weights All dimensions, carat weights, and structural measurements of mounted gemstones are approximate. These estimations are calculated based on visible dimensions, as the mounting prevents direct, precise weighing and measurement.

Scope of Analysis (Main vs. Side Stones) Unless specifically requested by the client and agreed upon by the laboratory prior to testing, analysis is conducted solely on the primary (main) gemstone(s). Side stones, accent diamonds, or secondary melee gems will not be tested or individual reports generated for them.

Manual Verification

Certificate Reverse Documentation

Method of Analysis

Gemstones Testing Disclosures

Terms & Limitations

Mini Report

Full Report

Advanced Scientific Report

Diamond Scientific Report

Jewelry Report

Full Report Gemstones

Standard Gemological Testing

Ruby & Sapphires

Emerald

Jadeite (Fei-cui)

Other Gemstones

Terms and Limitations

Laboratory Details

Connect with Us

Our Location

Manual Verification

Certificate Reverse Documentation

Method of Analysis

Gemstones Testing Disclosures

Terms & Limitations