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Cushion|Natural|GIA

1.51ct F SI1 Cushion Natural Diamond

EX • F/SI1 • GIA 2556191991

Certificate GIA 2556191991

Diamond specifications and retailer prices

From £3,472 GBP
HK$36,400 HKD
As of November 1, 2026
Save £3,844 GBP (53%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £7,316 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 2556191991. Listed at 18 retailers as of October 28, 2026, with prices from £3,472 to £7,316, a £3,844 spread on the same certified stone. Queensmith lists it at £7,316. 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
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 2556191991
Dimensions8.09 × 5.59 × 3.82 mm
L/W Ratio1.45
Top View
8.09 mm5.59 mm1.51 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2556191991
Side View
Table 65.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 68.3%

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: £7,316 GBP|Low: £3,434 GBP|High: £7,368 GBP|Avg: £4,865 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£3,472 GBP
Retailer 6£3,531 GBP
Retailer 2£3,699 GBP
Retailer 13£3,865 GBP
Retailer 14£3,954 GBP
Retailer 4£4,052 GBP
Retailer 8£4,436 GBP
Retailer 12£4,624 GBP
Retailer 5£4,741 GBP
Retailer 3£4,834 GBP
Retailer 7£5,051 GBP
Retailer 10£5,681 GBP
Retailer 9£6,812 GBP
Queensmith£7,316 GBP

28 data points across 14 retailers

18 retailers£3,472 GBP to £7,316 GBP

A
Cheapest Retailer
-
£3,472 GBP
HK$36,400 HKD
A
Retailer 2
-
£3,531 GBP
SGD 6,404 SGD
View
A
Retailer 3
-
£3,699 GBP
₹472,755 INR
View
A
Retailer 4
-
£3,865 GBP
$5,187 USD
View
A
Retailer 5
-
£3,954 GBP
SGD 7,171 SGD
View
A
Retailer 6
-
£4,052 GBP
$5,437 USD
View
B+
Retailer 7
-
£4,247 GBP
$5,699 USD
View
B+
Retailer 8
-
£4,248 GBP
$5,700 USD
View
B+
Retailer 9
-
£4,436 GBP
View
B+
Retailer 10
-
£4,624 GBP
$6,205 USD
View
Retailer 11
-
£4,624 GBP
A$9,547 AUD
View
Price last confirmed 29 days ago
B+
Retailer 12
-
£4,736 GBP
A$9,778 AUD
View
B+
Retailer 13
-
£4,741 GBP
$6,362 USD
View
B+
Retailer 14
-
£4,834 GBP
$6,487 USD
View
B+
Retailer 15
-
£5,051 GBP
€6,456 EUR
View
B+
Retailer 16
-
£5,681 GBP
ZAR 123,162 ZAR
View
B
Retailer 17
-
£6,812 GBP
View
Most Expensive
B
Queensmith
2556191991 · Oct 28
£7,316 GBP
View
17 more retailers have this diamond
Prices start from £3,472 GBPSave up to £3,844 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
£3,472 GBP