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Cushion|Natural|GIA

1.50ct F SI1 Cushion Natural Diamond

EX • F/SI1 • GIA 6551751587

Certificate GIA 6551751587

Diamond specifications and retailer prices

From £3,586 GBP
As of November 6, 2026
Save £3,440 GBP (49%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £7,420 GBP at Queensmith · As of October 22, 2026
View at Queensmith

About this 1.5ct natural cushion diamond

This 1.5ct 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 6551751587. Listed at 19 retailers as of November 4, 2026, with a 96% 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

1.50
Carat
F
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6551751587
Dimensions7.45 × 5.66 × 3.94 mm
L/W Ratio1.32
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Cavity, Natural
Top View
7.45 mm5.66 mm1.50 ctF / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6551751587
Side View
Table 66.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 69.6%

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: £7,420 GBP|Low: £3,557 GBP|High: £7,510 GBP|Avg: £4,982 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
November 7, 2026
Retailer 13£3,586 GBP
Retailer 7£3,789 GBP
Retailer 14£3,994 GBP
Retailer 11£4,247 GBP
Retailer 3£4,414 GBP
Retailer 8£4,450 GBP
Retailer 2£4,554 GBP
Retailer 4£4,707 GBP
Retailer 6£4,756 GBP
Retailer 5£4,900 GBP
Retailer 9£5,196 GBP
Retailer 10£5,834 GBP
Retailer 12£7,026 GBP
Queensmith£7,420 GBP

25 data points across 14 retailers

19 retailers£3,586 GBP to £7,026 GBP

A
Cheapest Retailer
-
£3,586 GBP
A
Retailer 2
-
£3,789 GBP
View
A
Retailer 3
-
£3,994 GBP
View
Retailer 4
-
£4,117 GBP
View
Price last confirmed 24 days ago
B+
Retailer 5
-
£4,247 GBP
View
B+
Retailer 6
-
£4,392 GBP
View
B+
Retailer 7
-
£4,393 GBP
View
B+
Retailer 8
-
£4,414 GBP
View
Final sale: no returns
B+
Retailer 9
-
£4,450 GBP
View
B+
Retailer 10
-
£4,554 GBP
View
B+
Retailer 11
-
£4,707 GBP
View
Retailer 12
-
£4,756 GBP
View
Price last confirmed 29 days ago
Retailer 13
-
£4,811 GBP
View
Price last confirmed 22 days ago
B+
Retailer 14
-
£4,900 GBP
View
B+
Retailer 15
-
£4,962 GBP
View
B+
Retailer 16
-
£5,196 GBP
View
B+
Retailer 17
-
£5,834 GBP
View
B
Retailer 18
-
£7,026 GBP
View
Most Expensive
Queensmith
6551751587 · Oct 22
£7,420 GBP
View
Price last confirmed 15 days ago
18 more retailers have this diamond
Prices start from £3,586 GBPSave up to £3,440 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
1.50ct Cushion
£3,586 GBP