1 pcs Red Ruby - 5.79 ct - Deutsche Stiftung Edelsteinforschung (DSEF)
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Selected by Francesca Floramo
Graduate gemmologist from GIA with 20 years jewellery experience, specialising in brand jewellery.
Retail Estimate € 13,000 - € 16,000
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Natural ruby, 5.799 ct, pear-shaped gemstone with a mixed step cut, red and transparent, DSEF certificate no. 039057 confirming no thermal enhancement.
AI-assisted summary
Description from the seller
Natural Ruby – 5,799 ct – Untreated (NTE) – DSEF & ÖGEMG certified
For sale is a natural ruby with an attractive red color and characteristic natural inclusions. The gemstone has been examined by independent gemological laboratories and identified as natural corundum of the ruby variety.
Gemstone data
* Stone: Natural ruby
* Mineral: Natural corundum
* Weight: 5.799 ct
* Dimensions: 15.88 × 10.16 × 3.65 mm
* Shape: Pear
* Cut: Faceted / Mixed Step Cut
* Color: Red
* Flaws: The ruby has a small blemish on one side as well as on the tip)
Transparency and Clarity
The stone is described as transparent in the DSEF report. As with many natural rubies, noticeable natural inclusions may be visible to the naked eye. These features are of natural origin and do not indicate a defect; they document the authenticity of the gemstone.
Treatment
The DSEF German Gem Lab and the Austrian Gemmological Society were unable to find any indications of heat treatment (NTE – No Thermal Enhancement / No Heating Indications).
Certificates
* DSEF German Gem Lab (Idar-Oberstein), Report No. 039057 dated 13.05.2025
Both reports confirm a natural ruby with no detectable heat treatment.
Note
Please review the photos carefully, as these are part of the description. Natural inclusions, growth features, and color nuances are typical for natural rubies and underscore their natural origin.
The ruby will be securely packaged and insured for shipment, including accompanying certificates.
Natural Ruby – 5,799 ct – Untreated (NTE) – DSEF & ÖGEMG certified
For sale is a natural ruby with an attractive red color and characteristic natural inclusions. The gemstone has been examined by independent gemological laboratories and identified as natural corundum of the ruby variety.
Gemstone data
* Stone: Natural ruby
* Mineral: Natural corundum
* Weight: 5.799 ct
* Dimensions: 15.88 × 10.16 × 3.65 mm
* Shape: Pear
* Cut: Faceted / Mixed Step Cut
* Color: Red
* Flaws: The ruby has a small blemish on one side as well as on the tip)
Transparency and Clarity
The stone is described as transparent in the DSEF report. As with many natural rubies, noticeable natural inclusions may be visible to the naked eye. These features are of natural origin and do not indicate a defect; they document the authenticity of the gemstone.
Treatment
The DSEF German Gem Lab and the Austrian Gemmological Society were unable to find any indications of heat treatment (NTE – No Thermal Enhancement / No Heating Indications).
Certificates
* DSEF German Gem Lab (Idar-Oberstein), Report No. 039057 dated 13.05.2025
Both reports confirm a natural ruby with no detectable heat treatment.
Note
Please review the photos carefully, as these are part of the description. Natural inclusions, growth features, and color nuances are typical for natural rubies and underscore their natural origin.
The ruby will be securely packaged and insured for shipment, including accompanying certificates.
Details
Number of stones
1
Lab report number
039057
Gemstone type
Ruby
Total carat weight
5.79
Gemstone colour
Red
Cut grade
Excellent
Transparency
Transparent
Treatment
No evidence of treatment, No heat treatment
Origin as given on certificate
No origin given
Laboratory report
Deutsche Stiftung Edelsteinforschung (DSEF)
Sealed by laboratory
No
Shape
Pear
Cutting style
Mixed cut
Sold by
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Catawiki always aims to offer you the best possible buying experience. Our experts virtually review and select every object in line with our submission guidelines. While we strive to provide a detailed description and photographs of each jewellery object, discrepancies or inaccuracies may occur. It is your responsibility to review all of the information provided about an object, including the condition and description, before placing an order. Sellers are responsible for the information, pictures and description provided, including the quality, quantity and nature of the jewelry supplied. A small imperfection that cannot be seen in the photo but is included in the description is not a non-conformity. A Lab Report is not a guarantee, valuation or appraisal regarding the articles described therein. A Lab Report contains only the characteristics of an article described after it has been graded, tested, examined, and analyzed using the techniques and equipment used at the time of the examination from that specific Lab. The results of any other examination performed on the article may differ depending when, how, by whom and with which grading standard the article is examined. In addition, any changes and improvements in techniques and equipment that may have occurred which may enable the examiner to detect, among other things, the use of processes for altering the characteristics of an article which use was previously undetectable, does not automatically mean the object does not conform to its description.
Catawiki always aims to offer you the best possible buying experience. Our experts virtually review and select every object in line with our submission guidelines. While we strive to provide a detailed description and photographs of each jewellery object, discrepancies or inaccuracies may occur. It is your responsibility to review all of the information provided about an object, including the condition and description, before placing an order. Sellers are responsible for the information, pictures and description provided, including the quality, quantity and nature of the jewelry supplied. A small imperfection that cannot be seen in the photo but is included in the description is not a non-conformity. A Lab Report is not a guarantee, valuation or appraisal regarding the articles described therein. A Lab Report contains only the characteristics of an article described after it has been graded, tested, examined, and analyzed using the techniques and equipment used at the time of the examination from that specific Lab. The results of any other examination performed on the article may differ depending when, how, by whom and with which grading standard the article is examined. In addition, any changes and improvements in techniques and equipment that may have occurred which may enable the examiner to detect, among other things, the use of processes for altering the characteristics of an article which use was previously undetectable, does not automatically mean the object does not conform to its description.
