GRS Gemstone Reports

GRS gemstone reports are issued for individual loose gemstones, gemstone pairs, gemstone sets, as well as for mounted jewellery (rings, ear clips and necklaces etc.) providing the mounting allows for adequate testing. GRS gemstone reports include the following data based upon our judgment on the day of testing:

  1. Report Number

    Each report bears a unique 10 or 11 digit number, e.g. 2107-078888. This individual document number is critical to substantiate a reports’ authenticity.

  2. Date

    The date on the report identifies the date when the item was received and processed for examination at one of our laboratory locations.

  3. Object Description

    A brief description identifies an item being tested; e.g. “One faceted gemstone” or “Necklace with 10 faceted gemstones”.

  4. Identification

    Descriptive identity of gemstone examination.

    Examined stones of natural formation, are identified as Natural before the items’ name. Items produced from a synthetic crystal, will bear the term Synthetic in front of the name (e.g. Synthetic Ruby). Stones that have undergone rigorous treatment will be marked as Treated in front of the identifying name (e.g. Treated Natural Ruby).

  5. Color Photo

    A full color image captured at the time of testing of item. Color and size may vary slightly from the actual item.

  6. Shape / Cut

    Describes both the shape (girdle outline) and the cut of the tested item. Shapes can be round, oval, octagonal, fancy, etc.

    Cut refers to the facet pattern, e.g. brilliant cut, step cut, polished, step/step etc. Step cut stones usually report the number of steps in brackets e.g. brilliant/step (4).

  7. Color

    Describes the spectral hue of the gemstone, e.g. red, blue, green, yellowish-green etc. Certain gemstones will be designated GRS-type color-description e.g. GRS-type Pigeon’s Blood or GRS-type Royal Blue.

  8. Comment

    Describes observations noted on the gemstone such as possible enhancement (e.g. heat-treatment, clarity enhancement using oils or resins, dying etc.). In certain rare cases, determination of enhancement of the tested item is not possible. In these cases we will indicate Treatment undeterminable.

    Refer to the Enhancement Disclosure page for further details.

  9. Origin Opinion

    By default, all GRS reports include a geographical origin opinion if such is determinable. No additional charges apply for this service.

    A gemstones’ Determination of Authenticity and Country of Origin is based on the testing of the physical and chemical properties of that stone. A conclusion is reached after examining the analysis of the internal characteristics (e.g. inclusions and growth structures) using standard gemological devices and modern analytical instruments (e.g. FTIR, UV & PL spectrometers, EDXRF & LIBS). The conclusion as to country of origin, authenticity, and treatment status of gemstones is an opinion of the laboratory based on direct comparisons of the findings with those obtained from the analyses of reference materials and published literature. To the best degree possible, GRS continuously updates this extensive knowledge base.

    Examined stones that do not produce sufficient data to arrive at an origin opinion will not have such information included. Please note that since we do not charge additionally for the origin opinions, refunds are not provided in such cases.

  10. QR Code

    A unique QR (Quick Response) code printed on each gemstone report can be used to verify the authenticity of that report. Using a smart device with a QR-scanner app, scan the code and verify if the report appears in our database. Alternatively you can go to our Report Verification page


  11. Terms & Conditions (reverse of document)

    The reverse side of our reports contains Terms & Conditions as well as helpful treatment disclosure information. The Terms & Conditions are to be considered an essential part of the contract with GRS Gemresearch Swisslab AG.

GRS Report Samples
Sample – Pair with 2 different origins

Gemstones submitted as a pair may have a different country of origin. In these cases we will state their origin in the order ‘From Left to Right’. In the example above stone 3.26ct (left) has the origin ‘Sri Lanka’ and stone 3.01ct (right) has the origin ‘West Africa’ (Mambilla Plateau – Nigeria or Cameroon).

Special Comment

Certain gemstones are rarer than others and possess exceptional properties in contrast to other gemstones in our database. In such cases we offer a short written Special Comment about that specific gem. Please note: Special comments are offered at the discretion of GRS and are awarded only to qualifying stones.

Platinum Rarity Award

GRS researches the rarity of gemstones in comparison to those in our database. This comparison is conducted with GRS data of over 20 years and a databank containing 25 years of auction results by the world’s leading auction houses.

Depending on a gemstones’ relative rarity and value, it will be classified as either Important, or even Magnificent.

A gemstone’s unique properties are described on a separate appendix page with a rarity comment. Award reports are distinguished by their unique Award number (in addition to the GRS report number, the special award hologram sticker as well as a special red award report cover). Please note: Platinum Rarity Awards are offered at the discretion of GRS and are awarded only to qualifying stones.