CaratHunter
Plans
Cushion|Natural|GIA

1.50ct E SI1 Cushion Natural Diamond

EX • E/SI1 • GIA 2557664390

Certificate GIA 2557664390

Diamond specifications and retailer prices

From £3,489 GBP
HK$36,300 HKD
As of October 29, 2026
Save £3,911 GBP (53%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £7,401 GBP at Queensmith · As of October 28, 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 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 2557664390. Listed at 19 retailers as of October 28, 2026, with prices from £3,489 to £7,401, a £3,911 spread on the same certified stone. Queensmith lists it at £7,401. 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
E
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2557664390
Dimensions7.39 × 5.70 × 3.89 mm
L/W Ratio1.30
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Cavity, Cloud, Needle
Top View
7.39 mm5.70 mm1.50 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2557664390
Side View
Table 67.0%CrownGirdle: MED-VTKPavilionCulet: NoneDepth 68.4%

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: Oct 29
Current: £7,401 GBP|Low: £3,489 GBP|High: £7,458 GBP|Avg: £4,968 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
October 29, 2026
Retailer 15£3,489 GBP
Retailer 8£3,778 GBP
Retailer 14£3,930 GBP
Retailer 13£4,017 GBP
Retailer 6£4,150 GBP
Retailer 4£4,334 GBP
Retailer 9£4,419 GBP
Retailer 2£4,491 GBP
Retailer 7£4,673 GBP
Retailer 5£4,814 GBP
Retailer 3£4,909 GBP
Retailer 11£5,123 GBP
Retailer 12£5,718 GBP
Retailer 10£6,955 GBP
Queensmith£7,401 GBP

22 data points across 15 retailers

19 retailers£3,489 GBP to £7,401 GBP

A
Cheapest Retailer
-
£3,489 GBP
HK$36,300 HKD
A
Retailer 2
-
£3,778 GBP
₹479,215 INR
View
A
Retailer 3
-
£3,930 GBP
$5,234 USD
View
A
Retailer 4
-
£4,017 GBP
SGD 7,229 SGD
View
A
Retailer 5
-
£4,150 GBP
SGD 7,468 SGD
View
A
Retailer 6
-
£4,315 GBP
$5,746 USD
View
A
Retailer 7
-
£4,318 GBP
$5,750 USD
View
A
Retailer 8
-
£4,334 GBP
$5,772 USD
View
Final sale: no returns
A
Retailer 9
-
£4,419 GBP
View
A
Retailer 10
-
£4,491 GBP
View
Retailer 11
-
£4,673 GBP
A$9,573 AUD
View
Price last confirmed 19 days ago
Retailer 12
-
£4,727 GBP
$6,295 USD
View
Price last confirmed 13 days ago
B+
Retailer 13
-
£4,792 GBP
A$9,818 AUD
View
B+
Retailer 14
-
£4,814 GBP
$6,411 USD
View
B+
Retailer 15
-
£4,909 GBP
$6,537 USD
View
B+
Retailer 16
-
£5,123 GBP
€6,497 EUR
View
B+
Retailer 17
-
£5,718 GBP
ZAR 123,020 ZAR
View
B+
Retailer 18
-
£6,955 GBP
View
Most Expensive
B
Queensmith
2557664390 · Oct 28
£7,401 GBP
View
18 more retailers have this diamond
Prices start from £3,489 GBPSave up to £3,911 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
£3,489 GBP