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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 £113,891 GBP
$152,601 USD
As of October 31, 2026
Save £92,230 GBP (45%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £206,121 GBP 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 £113,891 to £206,121, a £92,230 spread on the same certified stone. MOH London lists it at £206,121. 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
Colour
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: £206,121 GBP|Low: £112,554 GBP|High: £207,493 GBP|Avg: £140,070 GBP|+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£112,554 GBP
Retailer 10£117,867 GBP
Retailer 8£119,567 GBP
Retailer 7£122,260 GBP
Retailer 9£126,667 GBP
Retailer 2£127,970 GBP
Retailer 4£137,916 GBP
Retailer 3£155,238 GBP
Retailer 5£157,995 GBP
MOH London£206,121 GBP

41 data points across 10 retailers

18 retailers£113,891 GBP to £206,121 GBP

A
Cheapest Retailer
-
£113,891 GBP
$152,601 USD
B+
Retailer 2
-
£117,867 GBP
$157,929 USD
View
B+
Retailer 3
-
£118,057 GBP
$158,183 USD
View
B+
Retailer 4
-
£119,567 GBP
$160,207 USD
View
Retailer 5
-
£122,260 GBP
A$252,024 AUD
View
Price last confirmed 27 days ago
B+
Retailer 6
-
£126,667 GBP
$169,720 USD
View
B+
Retailer 7
-
£127,970 GBP
View
Retailer 8
-
£131,276 GBP
$175,896 USD
View
Price last confirmed 15 days ago
B+
Retailer 9
-
£134,951 GBP
$180,820 USD
View
B+
Retailer 10
-
£134,951 GBP
$180,820 USD
View
Retailer 11
-
£136,746 GBP
$183,225 USD
View
Price last confirmed 36 days ago
B+
Retailer 12
-
£137,916 GBP
View
B+
Retailer 13
-
£139,452 GBP
$186,850 USD
View
Retailer 14
-
£142,216 GBP
$190,554 USD
View
Price last confirmed 39 days ago
Retailer 15
-
£147,686 GBP
$197,883 USD
View
Price last confirmed 39 days ago
B+
Retailer 16
-
£155,238 GBP
€198,097 EUR
View
B+
Retailer 17
-
£157,995 GBP
ZAR 3,419,970 ZAR
View
Most Expensive
B
MOH London
20FBA816C · Oct 29
£206,121 GBP
View
17 more retailers have this diamond
Prices start from £113,891 GBPSave up to £92,230 GBP

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
£113,891 GBP