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Cushion|Lab Grown|IGI

1.21ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG840633344

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG840633344

Diamond specifications and retailer prices

From £338 GBP
$453 USD
As of November 1, 2026
Save £1,401 GBP (81%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £1,739 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 1.21ct lab-grown cushion diamond

This 1.21ct lab-grown cushion sits in the classic one-carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG840633344 or 840633344. Listed at 17 retailers as of October 31, 2026, with prices from £338 to £1,739, a £1,401 spread on the same certified stone. Brilliant Earth lists it at £1,739. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.5°
Pavilion angle37.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840633344
Dimensions7.66 × 5.47 × 3.61 mm
L/W Ratio1.40
Girdle conditionFaceted
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
7.66 mm5.47 mm1.21 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840633344
Side View
Table 61.0%Crown 32.5°Girdle: MED-STKPavilion 37.5°Culet: NoneDepth 66.0%

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 1
Current: £1,739 GBP|Low: £338 GBP|High: £1,888 GBP|Avg: £908 GBP|-7.9%
Brilliant Earth
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
Retailer 16
Retailer 17
November 1, 2026
Retailer 3£338 GBP
Retailer 16£364 GBP
Retailer 10£375 GBP
Retailer 13£474 GBP
Retailer 5£537 GBP
Retailer 6£578 GBP
Retailer 11£592 GBP
Retailer 17£611 GBP
Retailer 15£626 GBP
Retailer 12£632 GBP
Retailer 14£875 GBP
Retailer 8£1,172 GBP
Retailer 4£1,197 GBP
Retailer 7£1,263 GBP
Retailer 2£1,423 GBP
Retailer 9£1,731 GBP
Brilliant Earth£1,739 GBP

25 data points across 17 retailers

17 retailers£338 GBP to £1,739 GBP

A
Cheapest Retailer
-
£338 GBP
$453 USD
Final sale: no returns
Retailer 2
-
£364 GBP
$488 USD
View
Price last confirmed 7 days ago
A
Retailer 3
-
£375 GBP
View
A
Retailer 4
-
£474 GBP
$635 USD
View
A
Retailer 5
-
£537 GBP
$719 USD
View
A
Retailer 6
-
£578 GBP
$775 USD
View
A
Retailer 7
-
£592 GBP
View
A
Retailer 8
-
£611 GBP
$819 USD
View
A
Retailer 9
-
£626 GBP
ZAR 13,540 ZAR
View
A
Retailer 10
-
£632 GBP
€807 EUR
View
B+
Retailer 11
-
£875 GBP
$1,172 USD
View
Retailer 12
-
£1,172 GBP
$1,570 USD
View
Price last confirmed 18 days ago
B+
Retailer 13
-
£1,197 GBP
$1,604 USD
View
B+
Retailer 14
-
£1,263 GBP
SGD 2,287 SGD
View
B+
Retailer 15
-
£1,423 GBP
View
B
Retailer 16
-
£1,731 GBP
$2,319 USD
View
Most Expensive
B
Brilliant Earth
21729045A · Oct 31
£1,739 GBP
$2,330 USD
View
16 more retailers have this diamond
Prices start from £338 GBPSave up to £1,401 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
£338 GBP