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Cushion|Natural|GIA

1.21ct E SI1 Cushion Natural Diamond

ID • E/SI1 • GIA 6551518018

Certificate GIA 6551518018

Diamond specifications and retailer prices

From £1,969 GBP
As of November 6, 2026
Save £2,403 GBP (55%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £4,372 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 1.21ct natural cushion diamond

This 1.21ct natural cushion sits in the classic one-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 6551518018. Listed at 16 retailers as of November 1, 2026, with prices from £1,969 to £4,372, a £2,403 spread on the same certified stone. MOH London lists it at £4,372. 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

1.21
Carat
E
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6551518018
Dimensions7.09 × 5.46 × 3.75 mm
L/W Ratio1.30
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Cloud, Needle, Indented Natural
Top View
7.09 mm5.46 mm1.21 ctE / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 6551518018
Side View
Table 64.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 68.7%

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: £4,372 GBP|Low: £1,951 GBP|High: £4,570 GBP|Avg: £2,755 GBP|-4.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 9£1,969 GBP
Retailer 2£2,052 GBP
Retailer 3£2,350 GBP
Retailer 8£2,387 GBP
Retailer 11£2,412 GBP
Retailer 10£2,614 GBP
Retailer 6£2,689 GBP
Retailer 4£2,741 GBP
Retailer 12£2,772 GBP
Retailer 5£3,042 GBP
Retailer 7£3,190 GBP
MOH London£4,372 GBP

29 data points across 12 retailers

16 retailers£1,969 GBP to £4,372 GBP

A
Cheapest Retailer
-
£1,969 GBP
A
Retailer 2
-
£2,052 GBP
View
B+
Retailer 3
-
£2,350 GBP
View
B+
Retailer 4
-
£2,387 GBP
View
B+
Retailer 5
-
£2,412 GBP
View
Final sale: no returns
B+
Retailer 6
-
£2,513 GBP
View
B+
Retailer 7
-
£2,514 GBP
View
Retailer 8
-
£2,614 GBP
View
Price last confirmed 8 days ago
B+
Retailer 9
-
£2,665 GBP
View
B+
Retailer 10
-
£2,689 GBP
View
B+
Retailer 11
-
£2,741 GBP
View
B+
Retailer 12
-
£2,772 GBP
View
Retailer 13
-
£2,907 GBP
View
Price last confirmed 29 days ago
B+
Retailer 14
-
£3,042 GBP
View
B+
Retailer 15
-
£3,190 GBP
View
Most Expensive
B
MOH London
24DD57394 · Nov 1
£4,372 GBP
View
15 more retailers have this diamond
Prices start from £1,969 GBPSave up to £2,403 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
1.21ct Cushion
£1,969 GBP