Blue Star Sapphire - 7.47 ct - Gem research Swiss Lab (GRS) - NO Heat, Ceylon Good Star
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€ 1,050
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Expert
Selected by Purificacion Aquino Garcia
Holds a gemmology degree from IGE Madrid and an MBA from University of Santiago de Compostela.
Retail Estimate € 3,800 - € 4,700
 | €1,050 |
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Natural Star Sapphire, 1 stone, 7.47 ct, blue, oval cabochon, no heat, origin Sri Lanka, certified by GRS GemResearch Swisslab.
AI-assisted summary
Description from the seller
Royal Antwerp Gem – Natural Star Sapphire – 7.47 ct – Sri Lanka – No Heat – GRS Swiss Lab Certified
⸻
DESCRIPTION
An impressive Natural Star Sapphire weighing 7.47 ct, displaying a beautiful blue color and a distinct natural star effect (asterism).
The gemstone has an oval cabochon shape and has been partially polished, preserving the characteristics responsible for its optical star phenomenon.
The sapphire has been examined and certified by GRS GemResearch Swisslab, Switzerland. According to the GRS report, its geographic origin is Sri Lanka (Ceylon).
Importantly, the report states “No indication of thermal treatment”, making this an unheated natural Sri Lankan star sapphire.
With its substantial 7.47 ct weight, natural asterism, Sri Lankan origin and no-heat status, this is an attractive stone for collectors as well as a distinctive bespoke jewelry piece.
⸻
SPECIFICATIONS
Gemstone: Natural Star Sapphire
Weight: 7.47 ct
Color: Blue
Shape: Oval
Cut: Cabochon / Partially Polished
Dimensions: 11.79 × 8.40 × 7.06 mm
Optical Phenomenon: Asterism (Star Effect)
Origin: Sri Lanka (Ceylon)
Treatment: No indication of thermal treatment
Laboratory: GRS GemResearch Swisslab, Switzerland
Report No.: GRS2026-097534
Report Date: 17 September 2026
⸻
SHIPPING
The gemstone will be shipped securely, fully insured and with international tracking.
Professional handling and careful packing are provided to ensure safe delivery.
⸻
PACKAGING
The gemstone will be carefully packed in a protective gemstone box/bag together with its original GRS GemResearch Swisslab report.
⸻
DEALER NOTE
PARAIBA – Fine Gemstones
We specialize in carefully selected natural colored gemstones, with a focus on quality, transparency and professional gemological certification.
Our gemstones are individually selected and, where appropriate, submitted to internationally recognized gemological laboratories for independent examination.
⸻
NOTES
The star effect is best observed under a single direct light source and may appear differently depending on the position and intensity of the light.
Photographs and videos are intended to represent the gemstone as accurately as possible. Actual colors may vary slightly depending on lighting conditions, camera settings and screen calibration.
Please refer to the GRS report for the independent gemological identification, treatment information and origin determination.
Seller's Story
Paraiba is a Belgium-based gemstone dealer with a passion for exceptional natural gemstones and mineral treasures from around the world.
For many years, we have personally sourced and selected gemstones through trusted networks of miners, cutters, collectors, and dealers across Asia, Africa, South America, and Europe. Every stone is chosen individually based on its beauty, character, rarity, and overall value.
We work exclusively with respected gemological laboratories and independent experts, including renowned institutions in Antwerp, one of the world’s most important centers for the gemstone and diamond trade. Whenever possible, gemstones are accompanied by professional certification to provide buyers with additional confidence and transparency.
Our philosophy is simple: we sell only gemstones that we would proudly add to our own collection. We believe that every gemstone has a story, and we take great care in presenting each piece honestly and accurately.
Today, with more than 500 successful sales and a 100% customer satisfaction score, we continue our search for remarkable gemstones across the globe, bringing unique finds directly to collectors, investors, jewelers, and gemstone enthusiasts.
Thank you for visiting Paraiba and sharing our passion for natural treasures.
Royal Antwerp Gem – Natural Star Sapphire – 7.47 ct – Sri Lanka – No Heat – GRS Swiss Lab Certified
⸻
DESCRIPTION
An impressive Natural Star Sapphire weighing 7.47 ct, displaying a beautiful blue color and a distinct natural star effect (asterism).
The gemstone has an oval cabochon shape and has been partially polished, preserving the characteristics responsible for its optical star phenomenon.
The sapphire has been examined and certified by GRS GemResearch Swisslab, Switzerland. According to the GRS report, its geographic origin is Sri Lanka (Ceylon).
Importantly, the report states “No indication of thermal treatment”, making this an unheated natural Sri Lankan star sapphire.
With its substantial 7.47 ct weight, natural asterism, Sri Lankan origin and no-heat status, this is an attractive stone for collectors as well as a distinctive bespoke jewelry piece.
⸻
SPECIFICATIONS
Gemstone: Natural Star Sapphire
Weight: 7.47 ct
Color: Blue
Shape: Oval
Cut: Cabochon / Partially Polished
Dimensions: 11.79 × 8.40 × 7.06 mm
Optical Phenomenon: Asterism (Star Effect)
Origin: Sri Lanka (Ceylon)
Treatment: No indication of thermal treatment
Laboratory: GRS GemResearch Swisslab, Switzerland
Report No.: GRS2026-097534
Report Date: 17 September 2026
⸻
SHIPPING
The gemstone will be shipped securely, fully insured and with international tracking.
Professional handling and careful packing are provided to ensure safe delivery.
⸻
PACKAGING
The gemstone will be carefully packed in a protective gemstone box/bag together with its original GRS GemResearch Swisslab report.
⸻
DEALER NOTE
PARAIBA – Fine Gemstones
We specialize in carefully selected natural colored gemstones, with a focus on quality, transparency and professional gemological certification.
Our gemstones are individually selected and, where appropriate, submitted to internationally recognized gemological laboratories for independent examination.
⸻
NOTES
The star effect is best observed under a single direct light source and may appear differently depending on the position and intensity of the light.
Photographs and videos are intended to represent the gemstone as accurately as possible. Actual colors may vary slightly depending on lighting conditions, camera settings and screen calibration.
Please refer to the GRS report for the independent gemological identification, treatment information and origin determination.
Seller's Story
Paraiba is a Belgium-based gemstone dealer with a passion for exceptional natural gemstones and mineral treasures from around the world.
For many years, we have personally sourced and selected gemstones through trusted networks of miners, cutters, collectors, and dealers across Asia, Africa, South America, and Europe. Every stone is chosen individually based on its beauty, character, rarity, and overall value.
We work exclusively with respected gemological laboratories and independent experts, including renowned institutions in Antwerp, one of the world’s most important centers for the gemstone and diamond trade. Whenever possible, gemstones are accompanied by professional certification to provide buyers with additional confidence and transparency.
Our philosophy is simple: we sell only gemstones that we would proudly add to our own collection. We believe that every gemstone has a story, and we take great care in presenting each piece honestly and accurately.
Today, with more than 500 successful sales and a 100% customer satisfaction score, we continue our search for remarkable gemstones across the globe, bringing unique finds directly to collectors, investors, jewelers, and gemstone enthusiasts.
Thank you for visiting Paraiba and sharing our passion for natural treasures.
Details
Lab report number
GRS2026-097534
Gemstone type
Star Sapphire
Total carat weight
7.47
Gemstone colour
Blue
Transparency
Transparent
Clarity grade
Eye clean
Treatment
No evidence of treatment
Origin as given on certificate
Sri Lanka
Laboratory report
Gem research Swiss Lab (GRS)
Sealed by laboratory
No
Title additional information
NO Heat, Ceylon Good Star
Shape
Oval
Cutting style
Cabochon cut
Disclaimer
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.
