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Cushion|Natural|GIA

1.51ct E SI1 Cushion Natural Diamond

ID • E/SI1 • GIA 6541087758

Certificate GIA 6541087758

Diamond specifications and retailer prices

From £3,959 GBP
As of November 6, 2026
Save £3,703 GBP (48%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £7,809 GBP at Queensmith · As of October 28, 2026
View at Queensmith

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion 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 stated by the retailer rather than the lab and certified by GIA 6541087758. Listed at 19 retailers as of November 4, 2026, with a 94% 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
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6541087758
Dimensions7.78 × 5.93 × 3.92 mm
L/W Ratio1.31
Top View
7.78 mm5.93 mm1.51 ctE / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6541087758
Side View
Table 64.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 66.1%

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: Nov 6
Current: £7,809 GBP|Low: £3,921 GBP|High: £7,866 GBP|Avg: £5,467 GBP|+1.4%
Queensmith
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
November 6, 2026
Retailer 15£3,959 GBP
Retailer 2£4,169 GBP
Retailer 3£4,399 GBP
Retailer 14£4,531 GBP
Retailer 11£4,680 GBP
Retailer 5£4,814 GBP
Retailer 13£4,815 GBP
Retailer 9£4,952 GBP
Retailer 4£5,061 GBP
Retailer 6£5,103 GBP
Retailer 7£5,334 GBP
Retailer 8£5,666 GBP
Retailer 10£6,362 GBP
Retailer 12£7,662 GBP
Queensmith£7,809 GBP

29 data points across 15 retailers

19 retailers£3,959 GBP to £7,662 GBP

A
Cheapest Retailer
-
£3,959 GBP
A
Retailer 2
-
£4,169 GBP
View
A
Retailer 3
-
£4,399 GBP
View
A
Retailer 4
-
£4,531 GBP
View
Retailer 5
-
£4,536 GBP
View
Price last confirmed 22 days ago
A
Retailer 6
-
£4,680 GBP
View
B+
Retailer 7
-
£4,814 GBP
View
Final sale: no returns
B+
Retailer 8
-
£4,815 GBP
View
B+
Retailer 9
-
£4,840 GBP
View
Retailer 10
-
£4,842 GBP
View
Price last confirmed 21 days ago
B+
Retailer 11
-
£4,952 GBP
View
Retailer 12
-
£5,061 GBP
View
Price last confirmed 15 days ago
B+
Retailer 13
-
£5,103 GBP
View
B+
Retailer 14
-
£5,234 GBP
View
B+
Retailer 15
-
£5,334 GBP
View
B+
Retailer 16
-
£5,666 GBP
View
B+
Retailer 17
-
£6,362 GBP
View
B
Retailer 18
-
£7,662 GBP
View
Most Expensive
Queensmith
6541087758 · Oct 28
£7,809 GBP
View
Price last confirmed 9 days ago
18 more retailers have this diamond
Prices start from £3,959 GBPSave up to £3,703 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 Cushion
£3,959 GBP