CaratHunter
Plans
Radiant|Lab Grown|IGI

1.21ct G VS1 Radiant Lab Grown Diamond

ID • G/VS1 • IGI LG539225586

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

Certificate IGI LG539225586

Diamond specifications and retailer prices

From £174 GBP
As of November 4, 2026
Save £681 GBP (80%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £854 GBP at Brilliant Earth · As of November 4, 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 G colour (near-colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG539225586 or 539225586. Listed at 16 retailers as of November 4, 2026, with prices from £174 to £854, a £681 spread on the same certified stone. Brilliant Earth lists it at £854. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
G
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.2°
Pavilion angle35.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG539225586
Dimensions7.40 × 5.49 × 3.63 mm
L/W Ratio1.35
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.40 mm5.49 mm1.21 ctG / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG539225586
Side View
Table 64.5%Crown 37.2°Girdle: MediumPavilion 35.6°Culet: NoneDepth 66.1%

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: Nov 4
Current: £854 GBP|Low: £174 GBP|High: £877 GBP|Avg: £477 GBP|-2.5%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 5, 2026
Retailer 11£174 GBP
Retailer 9£193 GBP
Retailer 6£333 GBP
Retailer 8£333 GBP
Retailer 2£353 GBP
Retailer 10£429 GBP
Retailer 5£472 GBP
Retailer 7£623 GBP
Retailer 3£759 GBP
Retailer 4£771 GBP
Brilliant Earth£854 GBP

41 data points across 11 retailers

16 retailers£174 GBP to £854 GBP

Retailer 1
-
£149 GBP
Price last confirmed 34 days ago
A
Retailer 2
-
£174 GBP
View
Final sale: no returns
Retailer 3
-
£181 GBP
View
Price last confirmed 39 days ago
Retailer 4
-
£193 GBP
View
Price last confirmed 33 days ago
A
Retailer 5
-
£331 GBP
View
A
Retailer 6
-
£333 GBP
View
A
Retailer 7
-
£333 GBP
View
A
Retailer 8
-
£353 GBP
View
B+
Retailer 9
-
£429 GBP
View
B+
Retailer 10
-
£472 GBP
View
B+
Retailer 11
-
£497 GBP
View
Retailer 12
-
£620 GBP
View
Price last confirmed 36 days ago
B
Retailer 13
-
£623 GBP
View
B
Retailer 14
-
£660 GBP
View
B
Retailer 15
-
£771 GBP
View
Most Expensive
B
Brilliant Earth
6168464A · Nov 4
£854 GBP
$1,150 USD
View
15 more retailers have this diamond
Prices start from £174 GBPSave up to £681 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
£174 GBP