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Round|Natural|GIA

6.51ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 7511165306

Certificate GIA 7511165306

Diamond specifications and retailer prices

From €136,591 EUR
$152,601 USD
As of October 31, 2026
Save €109,298 EUR (44%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: €245,889 EUR at MOH London · As of November 1, 2026
View at MOH London

About this 6.51ct natural round diamond

This 6.51ct natural round sits in the over five carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 7511165306. Listed at 18 retailers as of October 31, 2026, with prices from €136,591 to €245,889, a €109,298 spread on the same certified stone. MOH London lists it at €245,889. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

6.51
Carat
D
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 7511165306
Dimensions11.87 × 11.80 × 7.49 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Knot, Feather, Indented Natural, Needle, Natural
Top View
11.87 mm11.80 mm6.51 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 7511165306
Side View
Table 58.0%Crown 35°Girdle: ThickPavilion 41.6°Culet: NoneDepth 63.2%

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: €245,889 EUR|Low: €134,989 EUR|High: €248,851 EUR|Avg: €167,877 EUR|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 6€134,989 EUR
Retailer 10€141,361 EUR
Retailer 8€143,400 EUR
Retailer 7€146,629 EUR
Retailer 9€151,915 EUR
Retailer 5€152,202 EUR
Retailer 3€164,912 EUR
Retailer 2€184,873 EUR
Retailer 4€190,500 EUR
MOH London€245,889 EUR

40 data points across 10 retailers

18 retailers€136,591 EUR to €245,889 EUR

A
Cheapest Retailer
-
€136,591 EUR
$152,601 USD
B+
Retailer 2
-
€141,361 EUR
$157,929 USD
View
B+
Retailer 3
-
€141,588 EUR
$158,183 USD
View
B+
Retailer 4
-
€143,400 EUR
$160,207 USD
View
Retailer 5
-
€146,629 EUR
A$252,024 AUD
View
Price last confirmed 29 days ago
B+
Retailer 6
-
€151,915 EUR
$169,720 USD
View
B+
Retailer 7
-
€152,202 EUR
£133,891 GBP
View
Retailer 8
-
€157,443 EUR
$175,896 USD
View
Price last confirmed 17 days ago
B+
Retailer 9
-
€161,850 EUR
$180,820 USD
View
B+
Retailer 10
-
€161,850 EUR
$180,820 USD
View
Retailer 11
-
€164,003 EUR
$183,225 USD
View
Price last confirmed 37 days ago
B+
Retailer 12
-
€164,912 EUR
£145,071 GBP
View
B+
Retailer 13
-
€167,248 EUR
$186,850 USD
View
Retailer 14
-
€170,563 EUR
$190,554 USD
View
Price last confirmed 40 days ago
Retailer 15
-
€177,123 EUR
$197,883 USD
View
Price last confirmed 41 days ago
B+
Retailer 16
-
€184,873 EUR
View
B+
Retailer 17
-
€190,500 EUR
ZAR 3,438,245 ZAR
View
Most Expensive
B
MOH London
20FBA816C · Nov 1
€245,889 EUR
£216,306 GBP
View
17 more retailers have this diamond
Prices start from €136,591 EURSave up to €109,298 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
6.51ct Round
€136,591 EUR