Radiant|Lab Grown|IGI

1.21ct E IF Radiant Lab Grown Diamond

VG • E/IF • IGI LG840640263

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG840640263

Diamond specifications and retailer prices

From £213 GBP
$285 USD
As of October 31, 2026
Save £1,526 GBP (88%) vs most expensive(unlock to see where)
15 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 radiant diamond

This 1.21ct lab-grown radiant sits in the classic one-carat band, graded E colour (colourless) and IF clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG840640263 or 840640263. Listed at 15 retailers as of October 31, 2026, with prices from £213 to £1,739, a £1,526 spread on the same certified stone. Brilliant Earth lists it at £1,739. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.21
Carat
E
Colour
IF
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle48.5°
Pavilion angle34.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840640263
Dimensions7.23 × 5.19 × 3.53 mm
L/W Ratio1.39
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
7.23 mm5.19 mm1.21 ctE / IF
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840640263
Side View
Table 61.0%Crown 48.5°Girdle: STK-THKPavilion 34.4°Culet: NoneDepth 68.0%

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: Oct 31
Current: £240 GBP|Low: £213 GBP|High: £1,016 GBP|Avg: £570 GBP|-4.1%
Retailer 1
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
November 1, 2026
Retailer 9£213 GBP
Retailer 1£240 GBP
Retailer 13£245 GBP
Retailer 8£368 GBP
Retailer 12£381 GBP
Retailer 7£427 GBP
Retailer 6£448 GBP
Retailer 5£574 GBP
Retailer 11£585 GBP
Retailer 10£732 GBP
Retailer 3£768 GBP
Retailer 2£768 GBP
Retailer 4£891 GBP
Retailer 14£999 GBP

25 data points across 14 retailers

15 retailers£213 GBP to £1,739 GBP

A
Cheapest Retailer
-
£213 GBP
$285 USD
A
Retailer 2
-
£240 GBP
View
A
Retailer 3
-
£245 GBP
$328 USD
View
Final sale: no returns
A
Retailer 4
-
£368 GBP
€469 EUR
View
A
Retailer 5
-
£381 GBP
$511 USD
View
A
Retailer 6
-
£427 GBP
View
Retailer 7
-
£448 GBP
$600 USD
View
Price last confirmed 5 days ago
Retailer 8
-
£574 GBP
A$1,184 AUD
View
Price last confirmed 7 days ago
B+
Retailer 9
-
£585 GBP
$784 USD
View
B
Retailer 10
-
£732 GBP
$981 USD
View
B+
Retailer 11
-
£768 GBP
A$1,584 AUD
View
B+
Retailer 12
-
£768 GBP
$1,030 USD
View
B+
Retailer 13
-
£891 GBP
View
B
Retailer 14
-
£999 GBP
$1,338 USD
View
Most Expensive
B
Brilliant Earth
22340637A · Oct 31
£1,739 GBP
$2,330 USD
View
14 more retailers have this diamond
Prices start from £213 GBPSave up to £1,526 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 Radiant
£213 GBP