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Cushion|Natural|GIA

1.51ct I SI1 Cushion Natural Diamond

EX • I/SI1 • GIA 6541862635

Certificate GIA 6541862635

Diamond specifications and retailer prices

From £2,493 GBP
HK$26,100 HKD
As of November 1, 2026
Save £2,758 GBP (53%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £5,484 GBP at Wholesale Diamonds Direct · As of October 23, 2026
View at Wholesale Diamonds Direct

About this 1.51ct natural cushion diamond

This 1.51ct natural cushion sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6541862635. Listed at 21 retailers as of November 1, 2026, with a 111% 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Pavilion angle36.9°
OriginNatural
Grading LabGIA
CertificateGIA 6541862635
Dimensions7.56 × 6.03 × 4.16 mm
L/W Ratio1.25
Top View
7.56 mm6.03 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6541862635
Side View
Table 64.0%CrownGirdle: STK-THKPavilion 36.9°Culet: NoneDepth 68.9%

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 1
Current: £3,174 GBP|Low: £2,493 GBP|High: £5,703 GBP|Avg: £3,483 GBP|-6.6%
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
Wholesale Diamonds Direct
November 2, 2026
Retailer 16£2,493 GBP
Retailer 15£2,890 GBP
Retailer 3£2,890 GBP
Retailer 6£2,952 GBP
Retailer 8£2,952 GBP
Retailer 14£3,041 GBP
Retailer 12£3,088 GBP
Retailer 1£3,174 GBP
Retailer 9£3,194 GBP
Retailer 2£3,254 GBP
Retailer 5£3,300 GBP
Retailer 11£3,366 GBP
Retailer 13£3,423 GBP
Retailer 7£3,429 GBP
Retailer 10£3,785 GBP
Retailer 4£4,231 GBP
Retailer 17£5,251 GBP
Wholesale Diamonds Direct£5,484 GBP

20 data points across 18 retailers

21 retailers£2,493 GBP to £5,251 GBP

A
Cheapest Retailer
-
£2,493 GBP
HK$26,100 HKD
A
Retailer 2
-
£2,890 GBP
$3,872 USD
View
A
Retailer 3
-
£2,890 GBP
€3,688 EUR
View
A
Retailer 4
-
£2,952 GBP
$3,956 USD
View
A
Retailer 5
-
£2,952 GBP
$3,956 USD
View
A
Retailer 6
-
£3,041 GBP
$4,074 USD
View
A
Retailer 7
-
£3,088 GBP
$4,138 USD
View
Final sale: no returns
A
Retailer 8
-
£3,131 GBP
A$6,454 AUD
View
A
Retailer 9
-
£3,174 GBP
View
A
Retailer 10
-
£3,194 GBP
$4,280 USD
View
B+
Retailer 11
-
£3,254 GBP
$4,360 USD
View
A
Retailer 12
-
£3,300 GBP
$4,422 USD
View
B+
Retailer 13
-
£3,366 GBP
$4,510 USD
View
A
Retailer 14
-
£3,423 GBP
View
Retailer 15
-
£3,429 GBP
$4,595 USD
View
Price last confirmed 13 days ago
B+
Retailer 16
-
£3,603 GBP
A$7,428 AUD
View
Retailer 17
-
£3,615 GBP
A$7,451 AUD
View
Price last confirmed 23 days ago
B+
Retailer 18
-
£3,785 GBP
€4,830 EUR
View
B+
Retailer 19
-
£4,231 GBP
ZAR 91,576 ZAR
View
B
Retailer 20
-
£5,251 GBP
View
Most Expensive
Wholesale Diamonds Direct
425965099 · Oct 23
£5,484 GBP
$7,348 USD
View
Price last confirmed 9 days ago
20 more retailers have this diamond
Prices start from £2,493 GBPSave up to £2,758 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
£2,493 GBP