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Radiant|Lab Grown|IGI

1.21ct E FL Radiant Lab Grown Diamond

ID • E/FL • IGI LG816616105

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

Certificate IGI LG816616105

Diamond specifications and retailer prices

From £225 GBP
$302 USD
As of October 30, 2026
Save £1,678 GBP (88%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £1,903 GBP at Brilliant Earth · As of October 29, 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 FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG816616105 or 816616105. Listed at 20 retailers as of October 29, 2026, with prices from £225 to £1,903, a £1,678 spread on the same certified stone. Brilliant Earth lists it at £1,903. 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 angle40.1°
Pavilion angle34.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816616105
Dimensions7.68 × 5.29 × 3.48 mm
L/W Ratio1.45
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
7.68 mm5.29 mm1.21 ctE / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816616105
Side View
Table 61.0%Crown 40.1°Girdle: MediumPavilion 34.5°Culet: NoneDepth 65.8%

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: Oct 30
Current: £1,903 GBP|Low: £215 GBP|High: £1,970 GBP|Avg: £801 GBP|-3.4%
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
October 30, 2026
Retailer 13£225 GBP
Retailer 2£254 GBP
Retailer 8£327 GBP
Retailer 3£358 GBP
Retailer 15£399 GBP
Retailer 12£411 GBP
Retailer 5£447 GBP
Retailer 10£457 GBP
Retailer 17£589 GBP
Retailer 14£735 GBP
Retailer 16£808 GBP
Retailer 7£881 GBP
Retailer 11£965 GBP
Retailer 6£980 GBP
Retailer 9£1,274 GBP
Retailer 4£1,717 GBP
Brilliant Earth£1,903 GBP

29 data points across 17 retailers

20 retailers£225 GBP to £1,903 GBP

A
Cheapest Retailer
-
£225 GBP
$302 USD
Final sale: no returns
Retailer 2
-
£253 GBP
$339 USD
View
Price last confirmed 28 days ago
A
Retailer 3
-
£254 GBP
View
Retailer 4
-
£306 GBP
$410 USD
View
Price last confirmed 33 days ago
Retailer 5
-
£327 GBP
$438 USD
View
Price last confirmed 27 days ago
A
Retailer 6
-
£358 GBP
$480 USD
View
A
Retailer 7
-
£399 GBP
$535 USD
View
A
Retailer 8
-
£411 GBP
ZAR 8,903 ZAR
View
A
Retailer 9
-
£447 GBP
€570 EUR
View
A
Retailer 10
-
£457 GBP
View
B+
Retailer 11
-
£589 GBP
$789 USD
View
B+
Retailer 12
-
£735 GBP
$985 USD
View
B+
Retailer 13
-
£808 GBP
$1,082 USD
View
B+
Retailer 14
-
£881 GBP
SGD 1,595 SGD
View
B
Retailer 15
-
£965 GBP
View
B
Retailer 16
-
£980 GBP
$1,313 USD
View
Retailer 17
-
£1,051 GBP
$1,408 USD
View
Price last confirmed 29 days ago
Retailer 18
-
£1,274 GBP
View
Price last confirmed 25 days ago
Retailer 19
-
£1,717 GBP
$2,300 USD
View
Price last confirmed 9 days ago
Most Expensive
B
Brilliant Earth
21421473A · Oct 29
£1,903 GBP
$2,550 USD
View
19 more retailers have this diamond
Prices start from £225 GBPSave up to £1,678 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
£225 GBP