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Round|Lab Grown|IGI

1.21ct E FL Round Lab Grown Diamond

ID • E/FL • IGI LG811638127

Shape and cutting style on the report: Round brilliant

Certificate IGI LG811638127

Diamond specifications and retailer prices

From £192 GBP
$257 USD
As of October 29, 2026
Save £1,099 GBP (85%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £1,291 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.21ct lab-grown round diamond

This 1.21ct lab-grown round sits in the classic one-carat band, graded E colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG811638127 or 811638127. Listed at 20 retailers as of October 29, 2026, with prices from £192 to £1,291, a £1,099 spread on the same certified stone. Brilliant Earth lists it at £1,291. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
E
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG811638127
Dimensions6.87 × 6.84 × 4.20 mm
L/W Ratio1.00
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
6.87 mm6.84 mm1.21 ctE / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG811638127
Side View
Table 57.0%Crown 34.1°Girdle: MediumPavilion 40.7°Culet: NoneDepth 61.3%

Caratlytics Score

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A+
Exceptional
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: Oct 29
Current: £1,291 GBP|Low: £189 GBP|High: £1,291 GBP|Avg: £566 GBP
Brilliant Earth
Retailer 2
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October 30, 2026
Retailer 8£192 GBP
Retailer 15£214 GBP
Retailer 4£222 GBP
Retailer 5£238 GBP
Retailer 10£238 GBP
Retailer 3£369 GBP
Retailer 12£393 GBP
Retailer 6£398 GBP
Retailer 13£409 GBP
Retailer 2£453 GBP
Retailer 7£492 GBP
Retailer 19£731 GBP
Retailer 18£764 GBP
Retailer 11£764 GBP
Retailer 9£803 GBP
Retailer 17£833 GBP
Retailer 14£954 GBP
Retailer 16£1,127 GBP
Brilliant Earth£1,291 GBP

38 data points across 19 retailers

20 retailers£192 GBP to £1,291 GBP

A+
Cheapest Retailer
-
£192 GBP
$257 USD
A
Retailer 2
-
£214 GBP
$287 USD
View
Final sale: no returns
A
Retailer 3
-
£222 GBP
$298 USD
View
A
Retailer 4
-
£238 GBP
$319 USD
View
A
Retailer 5
-
£238 GBP
$319 USD
View
Retailer 6
-
£241 GBP
$323 USD
View
Price last confirmed 59 days ago
A
Retailer 7
-
£369 GBP
$495 USD
View
A
Retailer 8
-
£393 GBP
€502 EUR
View
A
Retailer 9
-
£398 GBP
$533 USD
View
A
Retailer 10
-
£409 GBP
ZAR 8,845 ZAR
View
A
Retailer 11
-
£453 GBP
View
B+
Retailer 12
-
£492 GBP
$659 USD
View
B+
Retailer 13
-
£731 GBP
$979 USD
View
B+
Retailer 14
-
£764 GBP
SGD 1,383 SGD
View
B+
Retailer 15
-
£764 GBP
$1,024 USD
View
B+
Retailer 16
-
£803 GBP
$1,076 USD
View
B+
Retailer 17
-
£833 GBP
$1,116 USD
View
B+
Retailer 18
-
£954 GBP
View
Retailer 19
-
£1,127 GBP
$1,510 USD
View
Price last confirmed 13 days ago
Most Expensive
B
Brilliant Earth
21422382A · Oct 29
£1,291 GBP
$1,730 USD
View
19 more retailers have this diamond
Prices start from £192 GBPSave up to £1,099 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 Round
£192 GBP