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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 $152,601 USD
As of October 31, 2026
Save $123,579 USD (45%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: $276,179 USD at MOH London · As of October 29, 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 29, 2026, with prices from $152,601 to $276,179, a $123,579 spread on the same certified stone. MOH London lists it at $276,179. 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: $276,179 USD|Low: $150,810 USD|High: $278,018 USD|Avg: $187,679 USD|+0.4%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 6$150,810 USD
Retailer 10$157,929 USD
Retailer 8$160,207 USD
Retailer 7$163,815 USD
Retailer 9$169,720 USD
Retailer 2$171,466 USD
Retailer 4$184,793 USD
Retailer 3$208,002 USD
Retailer 5$211,696 USD
MOH London$276,179 USD

41 data points across 10 retailers

18 retailers$152,601 USD to $276,179 USD

A
Cheapest Retailer
-
$152,601 USD
B+
Retailer 2
-
$157,929 USD
View
B+
Retailer 3
-
$158,183 USD
View
B+
Retailer 4
-
$160,207 USD
View
Retailer 5
-
$163,815 USD
A$252,024 AUD
View
Price last confirmed 27 days ago
B+
Retailer 6
-
$169,720 USD
View
B+
Retailer 7
-
$171,466 USD
£135,012 GBP
View
Retailer 8
-
$175,896 USD
View
Price last confirmed 15 days ago
B+
Retailer 9
-
$180,820 USD
View
B+
Retailer 10
-
$180,820 USD
View
Retailer 11
-
$183,225 USD
View
Price last confirmed 36 days ago
B+
Retailer 12
-
$184,793 USD
£145,506 GBP
View
B+
Retailer 13
-
$186,850 USD
View
Retailer 14
-
$190,554 USD
View
Price last confirmed 39 days ago
Retailer 15
-
$197,883 USD
View
Price last confirmed 39 days ago
B+
Retailer 16
-
$208,002 USD
€198,097 EUR
View
B+
Retailer 17
-
$211,696 USD
ZAR 3,419,970 ZAR
View
Most Expensive
B
MOH London
20FBA816C · Oct 29
$276,179 USD
£217,464 GBP
View
17 more retailers have this diamond
Prices start from $152,601 USDSave up to $123,579 USD

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
$152,601 USD