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Round|Natural|GIA

1.51ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 6405890761

Certificate GIA 6405890761

Diamond specifications and retailer prices

From £9,287 GBP
As of November 1, 2026
Save £7,182 GBP (44%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £19,279 GBP at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6405890761. Listed at 22 retailers as of November 1, 2026, with a 77% 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
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6405890761
Dimensions7.42 × 7.39 × 4.49 mm
L/W Ratio1.00
Top View
7.42 mm7.39 mm1.51 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6405890761
Side View
Table 59.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 60.6%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £15,427 GBP|Low: £9,287 GBP|High: £17,609 GBP|Avg: £12,033 GBP|-4.0%
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
Retailer 15
Retailer 16
Retailer 17
Retailer 18
Retailer 19
Retailer 20
November 6, 2026
Retailer 18£9,287 GBP
Retailer 4£9,667 GBP
Retailer 11£9,721 GBP
Retailer 2£9,896 GBP
Retailer 17£10,380 GBP
Retailer 20£10,573 GBP
Retailer 13£10,677 GBP
Retailer 12£10,942 GBP
Retailer 3£11,279 GBP
Retailer 16£11,362 GBP
Retailer 7£11,455 GBP
Retailer 10£11,895 GBP
Retailer 5£11,984 GBP
Retailer 19£11,984 GBP
Retailer 6£12,273 GBP
Retailer 9£12,386 GBP
Retailer 14£12,707 GBP
Retailer 8£14,979 GBP
Retailer 1£15,427 GBP
Retailer 15£16,469 GBP

41 data points across 20 retailers

22 retailers£9,287 GBP to £16,469 GBP

B+
Cheapest Retailer
-
£9,287 GBP
B
Retailer 2
-
£9,667 GBP
View
B
Retailer 3
-
£9,721 GBP
View
B
Retailer 4
-
£9,896 GBP
View
B
Retailer 5
-
£9,973 GBP
View
B
Retailer 6
-
£10,380 GBP
View
Retailer 7
-
£10,573 GBP
View
Price last confirmed 8 days ago
B
Retailer 8
-
£10,677 GBP
View
Final sale: no returns
B
Retailer 9
-
£10,942 GBP
View
B
Retailer 10
-
£11,279 GBP
View
Retailer 11
-
£11,362 GBP
View
Price last confirmed 14 days ago
B
Retailer 12
-
£11,455 GBP
View
B
Retailer 13
-
£11,895 GBP
View
B
Retailer 14
-
£11,984 GBP
View
B
Retailer 15
-
£11,984 GBP
View
B
Retailer 16
-
£12,273 GBP
View
B
Retailer 17
-
£12,386 GBP
View
B
Retailer 18
-
£12,707 GBP
View
B
Retailer 19
-
£14,979 GBP
View
B
Retailer 20
-
£15,427 GBP
View
B
Retailer 21
-
£16,469 GBP
View
Most Expensive
Diamond Quarter
1.51SI1E646109B5N · Nov 5
£19,279 GBP
View
Price under review
21 more retailers have this diamond
Prices start from £9,287 GBPSave up to £7,182 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.

B+
1.51ct Round
£9,287 GBP