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Cushion|Natural|GIA

1.21ct I SI2 Cushion Natural Diamond

ID • I/SI2 • GIA 1558540135

Certificate GIA 1558540135

Diamond specifications and retailer prices

From £1,087 GBP
HK$11,400 HKD
As of November 1, 2026
Save £1,463 GBP (57%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,551 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 I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1558540135. Listed at 11 retailers as of November 1, 2026, with prices from £1,087 to £2,551, a £1,463 spread on the same certified stone. MOH London lists it at £2,551. 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
I
Colour
SI2
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryExcellent
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 1558540135
Dimensions7.33 × 5.46 × 3.68 mm
L/W Ratio1.34
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Needle
Top View
7.33 mm5.46 mm1.21 ctI / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1558540135
Side View
Table 67.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 67.4%

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: Nov 1
Current: £2,551 GBP|Low: £1,078 GBP|High: £2,598 GBP|Avg: £1,563 GBP|-1.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 6£1,087 GBP
Retailer 3£1,149 GBP
Retailer 7£1,173 GBP
Retailer 8£1,456 GBP
Retailer 2£1,513 GBP
Retailer 9£1,516 GBP
Retailer 5£1,586 GBP
Retailer 4£1,975 GBP
MOH London£2,551 GBP

36 data points across 9 retailers

11 retailers£1,087 GBP to £2,551 GBP

A
Cheapest Retailer
-
£1,087 GBP
HK$11,400 HKD
A
Retailer 2
-
£1,149 GBP
₹146,858 INR
View
A
Retailer 3
-
£1,173 GBP
SGD 2,127 SGD
View
A
Retailer 4
-
£1,371 GBP
$1,840 USD
View
Retailer 5
-
£1,456 GBP
$1,954 USD
View
Price last confirmed 17 days ago
A
Retailer 6
-
£1,505 GBP
A$3,108 AUD
View
A
Retailer 7
-
£1,513 GBP
$2,030 USD
View
A
Retailer 8
-
£1,516 GBP
SGD 2,750 SGD
View
A
Retailer 9
-
£1,586 GBP
View
B+
Retailer 10
-
£1,975 GBP
€2,524 EUR
View
Most Expensive
B
MOH London
7EE6C21E5 · Nov 1
£2,551 GBP
View
10 more retailers have this diamond
Prices start from £1,087 GBPSave up to £1,463 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
£1,087 GBP