Ring - 18 kt. White gold - 10.40ct. tw. Tanzanite - Diamond
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Current bid
€ 1,100
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Expert
Selected by Claudia Domante
Certified diamond grader by HRD with around 10 years' jewellery experience.
Retail Estimate € 13,000 - € 15,000
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 Bidder 2631 | €1,100 | |
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 Bidder 7078 | €1,000 | |
| Bidder 8108 | €750 | |
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A new 18K white gold ring featuring a natural 9.50 carat blue emerald-cut Tanzanite, surrounded by four natural baguette diamonds (0.90 ct total) in a four-prong setting, with IGI Report No. 756571538.
AI-assisted summary
Description from the seller
A jewel that does not whisper — it commands presence.
At the center stands a remarkable 9.50 carat natural D-BLOCK TANZANITE, cut in an elegant emerald shape, displaying a blue color with impressive transparency and architectural faceting.
Framed by four baguette-cut natural diamonds, this ring balances bold gemstone volume with refined high-jewellery geometry.
This is not a commercial piece.
It is a statement ring: strong proportions, certified quality, and a center stone size rarely seen in contemporary production.
MAIN STONE
Natural Tanzanite (Zoisite)
Cut: Emerald Cut
Weight: 9.50 Carats
Measurements: 12.30 × 11.35 × 6.65 mm
Color: Blue
Transparency: Transparent
Characteristics: Loupe clean
Treatment: Tanzanites are commonly heat enhanced; evidence is typically not detectable
The emerald cut enhances depth of color and creates a hall-of-mirrors effect, emphasizing the stone’s natural saturation and clarity.
SIDE STONES – NATURAL DIAMONDS
Quantity: 4
Cut: Baguette
Total estimated weight: 0.90 Carat
Individual size: approx. 4.00 × 2.30 mm to 4.80 × 2.50 mm
Color: F – G
Clarity: VVS – VS
Finish: Very Good
The clean linear geometry of the baguette diamonds enhances the architectural elegance of the center stone without competing with it.
MOUNTING
Solid 18K White Gold (750‰)
Engraved: “18k 5672”
Total gold weight: 6.50 grams
Classic four-prong setting for maximum light exposure.
Balanced proportions designed to support a high-carat gemstone securely while maintaining elegance and wearability.
FULL CERTIFICATION – MAXIMUM BUYER SECURITY
Accompanied by official IGI Report (Preview)
IGI Report No. 756571538
Issued: January 26, 2026
Tanzanite identified as Natural Zoisite
Diamond specifications confirmed
Carat weights of mounted stones are estimated
Complete transparency on gemstone identity and characteristics.
WHY THIS PIECE IS EXCEPTIONAL
• Large 9.50 ct natural Tanzanite D-Block (very rare) – rare size for fine jewellery
• Elegant emerald cut with strong architectural presence
• High quality baguette diamonds (F-G / VVS-VS)
• Full IGI documentation
• Statement jewel with strong visual impact
• High jewellery presence at a competitive market level
Large, well-cut Tanzanites of this size combined with fine diamond accents are increasingly difficult to source.
CONDITION
New.
The ring will be shipped exactly as shown in the photos.
Photos are part of the description.
SHIPPING
Express shipping with tracking
Fully insured
Secure professional packaging
CUSTOMS & IMPORT DUTIES
Import duties, VAT, and any customs charges are the responsibility of the buyer according to destination country regulations.
A bold gemstone.
Certified quality.
A ring designed to be remembered.
A jewel that does not whisper — it commands presence.
At the center stands a remarkable 9.50 carat natural D-BLOCK TANZANITE, cut in an elegant emerald shape, displaying a blue color with impressive transparency and architectural faceting.
Framed by four baguette-cut natural diamonds, this ring balances bold gemstone volume with refined high-jewellery geometry.
This is not a commercial piece.
It is a statement ring: strong proportions, certified quality, and a center stone size rarely seen in contemporary production.
MAIN STONE
Natural Tanzanite (Zoisite)
Cut: Emerald Cut
Weight: 9.50 Carats
Measurements: 12.30 × 11.35 × 6.65 mm
Color: Blue
Transparency: Transparent
Characteristics: Loupe clean
Treatment: Tanzanites are commonly heat enhanced; evidence is typically not detectable
The emerald cut enhances depth of color and creates a hall-of-mirrors effect, emphasizing the stone’s natural saturation and clarity.
SIDE STONES – NATURAL DIAMONDS
Quantity: 4
Cut: Baguette
Total estimated weight: 0.90 Carat
Individual size: approx. 4.00 × 2.30 mm to 4.80 × 2.50 mm
Color: F – G
Clarity: VVS – VS
Finish: Very Good
The clean linear geometry of the baguette diamonds enhances the architectural elegance of the center stone without competing with it.
MOUNTING
Solid 18K White Gold (750‰)
Engraved: “18k 5672”
Total gold weight: 6.50 grams
Classic four-prong setting for maximum light exposure.
Balanced proportions designed to support a high-carat gemstone securely while maintaining elegance and wearability.
FULL CERTIFICATION – MAXIMUM BUYER SECURITY
Accompanied by official IGI Report (Preview)
IGI Report No. 756571538
Issued: January 26, 2026
Tanzanite identified as Natural Zoisite
Diamond specifications confirmed
Carat weights of mounted stones are estimated
Complete transparency on gemstone identity and characteristics.
WHY THIS PIECE IS EXCEPTIONAL
• Large 9.50 ct natural Tanzanite D-Block (very rare) – rare size for fine jewellery
• Elegant emerald cut with strong architectural presence
• High quality baguette diamonds (F-G / VVS-VS)
• Full IGI documentation
• Statement jewel with strong visual impact
• High jewellery presence at a competitive market level
Large, well-cut Tanzanites of this size combined with fine diamond accents are increasingly difficult to source.
CONDITION
New.
The ring will be shipped exactly as shown in the photos.
Photos are part of the description.
SHIPPING
Express shipping with tracking
Fully insured
Secure professional packaging
CUSTOMS & IMPORT DUTIES
Import duties, VAT, and any customs charges are the responsibility of the buyer according to destination country regulations.
A bold gemstone.
Certified quality.
A ring designed to be remembered.
Details
Shape of surrounding stones
Tapered
Total carat weight of all stones
10.40
No. of main gemstones
1
Lab report number
756571538
Diamond colour grade of surrounding stones
F, G
Diamond type of surrounding stones
Natural
Laboratory report
International Gemological Institute (IGI)
Era
After 2000
Cutting style of surrounding stones
Baguette cut
Fineness
18 kt.
Brand jewellery
No
Total carat weight of main stone(s)
9.50
Number of diamonds surrounding stones
4
Metal
White gold
Colour of main stone
Blue
Main stone
Tanzanite
Total carat weight of surrounding stones
0.90
Total weight
6.5 g
Diamond clarity grade of surrounding stones
VS1, VVS1
Cut grade of main stone
Excellent
Surrounding stones
Diamond
Condition
New
Transparency of main stone
Transparent
Clarity grade of main stone
Loupe clean
Gender
Women
Country of Origin
Italy
Treatment of main stone
Commonly heated with no evidence of treatment
Shape of main stone
Emerald
Cutting style of main stone
Step cut
Country of origin of main stone (if certified)
Tanzania
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.
