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Cushion|Lab Grown|IGI

1.21ct F IF Cushion Lab Grown Diamond

EX • F/IF • IGI LG655426099

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG655426099

Diamond specifications and retailer prices

From £167 GBP
As of November 6, 2026
Save £938 GBP (85%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £1,632 GBP at Queensmith · As of October 27, 2026
View at Queensmith

About this 1.21ct lab-grown cushion diamond

This 1.21ct lab-grown cushion sits in the classic one-carat band, graded F colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG655426099 or 655426099. Listed at 21 retailers as of November 6, 2026, with a 561% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
F
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle36.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG655426099
Dimensions7.13 × 5.77 × 3.77 mm
L/W Ratio1.24
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
7.13 mm5.77 mm1.21 ctF / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG655426099
Side View
Table 60.0%Crown 34.2°Girdle: MED-STKPavilion 36.6°Culet: NoneDepth 65.3%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £314 GBP|Low: £167 GBP|High: £1,554 GBP|Avg: £561 GBP|-1.2%
Retailer 1
Retailer 2
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Retailer 4
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Retailer 19
November 6, 2026
Retailer 9£167 GBP
Retailer 3£186 GBP
Retailer 19£210 GBP
Retailer 5£256 GBP
Retailer 1£314 GBP
Retailer 12£315 GBP
Retailer 13£338 GBP
Retailer 4£369 GBP
Retailer 15£453 GBP
Retailer 2£461 GBP
Retailer 7£591 GBP
Retailer 10£608 GBP
Retailer 11£632 GBP
Retailer 8£638 GBP
Retailer 17£774 GBP
Retailer 14£868 GBP
Retailer 6£894 GBP
Retailer 18£971 GBP
Retailer 16£1,106 GBP

41 data points across 19 retailers

21 retailers£167 GBP to £1,106 GBP

A
Cheapest Retailer
-
£167 GBP
Final sale: no returns
Retailer 2
-
£186 GBP
View
Price last confirmed 13 days ago
A
Retailer 3
-
£210 GBP
View
B+
Retailer 4
-
£256 GBP
View
A
Retailer 5
-
£314 GBP
View
A
Retailer 6
-
£315 GBP
View
A
Retailer 7
-
£338 GBP
View
A
Retailer 8
-
£369 GBP
View
A
Retailer 9
-
£453 GBP
View
A
Retailer 10
-
£461 GBP
View
A
Retailer 11
-
£591 GBP
View
A
Retailer 12
-
£608 GBP
View
A
Retailer 13
-
£632 GBP
View
A
Retailer 14
-
£638 GBP
View
Retailer 15
-
£774 GBP
View
Price last confirmed 9 days ago
B+
Retailer 16
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£868 GBP
View
B+
Retailer 17
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£894 GBP
View
B+
Retailer 18
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£971 GBP
View
Retailer 19
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£990 GBP
View
Price last confirmed 44 days ago
B+
Retailer 20
-
£1,106 GBP
View
Most Expensive
Queensmith
LG655426099 · Oct 27
£1,632 GBP
View
Price last confirmed 10 days ago
20 more retailers have this diamond
Prices start from £167 GBPSave up to £938 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
£167 GBP