Round|Natural|GIA

6.66ct D FL Round Natural Diamond

EX • D/FL • GIA 1236430843

Certificate GIA 1236430843

Diamond specifications and retailer prices

From €403,454 EUR
£356,312 GBP
As of October 31, 2026
Save €260,109 EUR (39%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: €663,563 EUR at MOH London · As of November 1, 2026
View at MOH London

About this 6.66ct natural round diamond

This 6.66ct natural round sits in the over five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by GIA 1236430843. Listed at 10 retailers as of October 31, 2026, with prices from €403,454 to €663,563, a €260,109 spread on the same certified stone. MOH London lists it at €663,563. At this carat range, natural pricing varies dramatically across retailers, so the cross-retailer spread on this exact stone is your single best indicator of fair price.

The 4Cs

6.66
Carat
D
Color
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 1236430843
Dimensions11.93 × 12.00 × 7.45 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Girdle conditionFaceted
Top View
11.93 mm12.00 mm6.66 ctD / FL
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1236430843
Side View
Table 58.0%Crown 36.5°Girdle: ThinPavilion 40.8°Culet: NoneDepth 62.3%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: €663,563 EUR|Low: €390,571 EUR|High: €671,557 EUR|Avg: €474,297 EUR|-1.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 8€395,439 EUR
Retailer 5€403,454 EUR
Retailer 7€422,088 EUR
Retailer 6€439,932 EUR
Retailer 9€442,584 EUR
Retailer 2€448,374 EUR
Retailer 3€499,231 EUR
Retailer 4€514,089 EUR
MOH London€663,563 EUR

39 data points across 9 retailers

10 retailers€403,454 EUR to €663,563 EUR

Retailer 1
-
€395,439 EUR
A$682,348 AUD
Price last confirmed 29 days ago
A
Retailer 2
-
€403,454 EUR
£356,312 GBP
View
B+
Retailer 3
-
€422,088 EUR
$473,416 USD
View
Final sale: no returns
B+
Retailer 4
-
€439,932 EUR
$493,430 USD
View
B+
Retailer 5
-
€442,524 EUR
$496,337 USD
View
B+
Retailer 6
-
€442,584 EUR
$496,404 USD
View
B+
Retailer 7
-
€448,374 EUR
£395,983 GBP
View
B+
Retailer 8
-
€499,231 EUR
View
B+
Retailer 9
-
€514,089 EUR
ZAR 9,315,105 ZAR
View
Most Expensive
B
MOH London
972292FEC · Nov 1
€663,563 EUR
£586,028 GBP
View
9 more retailers have this diamond
Prices start from €403,454 EURSave up to €260,109 EUR

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
6.66ct Round
€403,454 EUR