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Round|Natural|GIA

1.51ct D SI2 Round Natural Diamond

EX • D/SI2 • GIA 6511657389

Certificate GIA 6511657389

Diamond specifications and retailer prices

From £4,280 GBP
HK$44,800 HKD
As of October 30, 2026
Save £3,879 GBP (48%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £9,991 GBP at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6511657389. Listed at 14 retailers as of October 29, 2026, with a 91% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.51
Carat
D
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6511657389
Dimensions7.32 × 7.28 × 4.51 mm
L/W Ratio1.01
Top View
7.32 mm7.28 mm1.51 ctD / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6511657389
Side View
Table 59.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.0%

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 30
Current: £5,203 GBP|Low: £4,213 GBP|High: £8,425 GBP|Avg: £5,374 GBP|-6.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
October 30, 2026
Retailer 8£4,280 GBP
Retailer 2£4,291 GBP
Retailer 7£4,443 GBP
Retailer 10£4,624 GBP
Retailer 13£4,812 GBP
Retailer 11£4,869 GBP
Retailer 14£5,070 GBP
Retailer 1£5,203 GBP
Retailer 12£5,209 GBP
Retailer 3£5,627 GBP
Retailer 6£5,704 GBP
Retailer 5£6,086 GBP
Retailer 4£6,217 GBP
Retailer 9£8,159 GBP

37 data points across 14 retailers

14 retailers£4,280 GBP to £8,159 GBP

A
Cheapest Retailer
-
£4,280 GBP
HK$44,800 HKD
Retailer 2
-
£4,291 GBP
$5,750 USD
View
Price last confirmed 9 days ago
A
Retailer 3
-
£4,443 GBP
$5,953 USD
View
A
Retailer 4
-
£4,624 GBP
$6,196 USD
View
A
Retailer 5
-
£4,812 GBP
$6,448 USD
View
A
Retailer 6
-
£4,869 GBP
$6,524 USD
View
Final sale: no returns
A
Retailer 7
-
£5,070 GBP
$6,793 USD
View
A
Retailer 8
-
£5,203 GBP
View
A
Retailer 9
-
£5,209 GBP
$6,980 USD
View
A
Retailer 10
-
£5,627 GBP
SGD 10,188 SGD
View
A
Retailer 11
-
£5,704 GBP
A$11,758 AUD
View
Retailer 12
-
£6,086 GBP
$8,155 USD
View
Price last confirmed 7 days ago
B+
Retailer 13
-
£8,159 GBP
View
Most Expensive
NZ Jewellers
67d7e602-8786-4201-9a30-7eff39b7dc82 · Sep 25
£9,991 GBP
$13,387 USD
View
Price last confirmed 35 days ago
13 more retailers have this diamond
Prices start from £4,280 GBPSave up to £3,879 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
1.51ct Round
£4,280 GBP