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Cushion|Natural|GIA

1.51ct F SI1 Cushion Natural Diamond

EX • F/SI1 • GIA 2556664337

Certificate GIA 2556664337

Diamond specifications and retailer prices

From £3,424 GBP
HK$35,900 HKD
As of November 1, 2026
Save £3,839 GBP (53%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £7,264 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 F 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 2556664337. Listed at 19 retailers as of October 28, 2026, with prices from £3,424 to £7,264, a £3,839 spread on the same certified stone. Queensmith lists it at £7,264. 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
F
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2556664337
Dimensions7.67 × 5.90 × 4.08 mm
L/W Ratio1.30
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Needle
Top View
7.67 mm5.90 mm1.51 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2556664337
Side View
Table 70.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 69.2%

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: Nov 1
Current: £7,264 GBP|Low: £3,396 GBP|High: £7,320 GBP|Avg: £4,765 GBP|+1.9%
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
November 2, 2026
Retailer 11£3,424 GBP
Retailer 7£3,654 GBP
Retailer 13£3,817 GBP
Retailer 14£3,904 GBP
Retailer 6£4,032 GBP
Retailer 4£4,213 GBP
Retailer 8£4,270 GBP
Retailer 2£4,379 GBP
Retailer 5£4,681 GBP
Retailer 3£4,774 GBP
Retailer 12£4,987 GBP
Retailer 10£5,607 GBP
Retailer 9£6,724 GBP
Queensmith£7,264 GBP

24 data points across 14 retailers

19 retailers£3,424 GBP to £7,264 GBP

A
Cheapest Retailer
-
£3,424 GBP
HK$35,900 HKD
A
Retailer 2
-
£3,654 GBP
₹467,020 INR
View
A
Retailer 3
-
£3,817 GBP
$5,122 USD
View
A
Retailer 4
-
£3,904 GBP
SGD 7,079 SGD
View
A
Retailer 5
-
£4,032 GBP
SGD 7,312 SGD
View
B+
Retailer 6
-
£4,192 GBP
$5,626 USD
View
B+
Retailer 7
-
£4,195 GBP
$5,630 USD
View
B+
Retailer 8
-
£4,213 GBP
$5,653 USD
View
Final sale: no returns
B+
Retailer 9
-
£4,270 GBP
View
B+
Retailer 10
-
£4,379 GBP
View
Retailer 11
-
£4,565 GBP
A$9,424 AUD
View
Price last confirmed 29 days ago
Retailer 12
-
£4,593 GBP
$6,164 USD
View
Price last confirmed 17 days ago
B+
Retailer 13
-
£4,659 GBP
A$9,618 AUD
View
B+
Retailer 14
-
£4,681 GBP
$6,281 USD
View
B+
Retailer 15
-
£4,774 GBP
$6,407 USD
View
B+
Retailer 16
-
£4,987 GBP
€6,374 EUR
View
B
Retailer 17
-
£5,607 GBP
ZAR 121,565 ZAR
View
B
Retailer 18
-
£6,724 GBP
View
Most Expensive
B
Queensmith
2556664337 · Oct 28
£7,264 GBP
View
18 more retailers have this diamond
Prices start from £3,424 GBPSave up to £3,839 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
£3,424 GBP