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Radiant|Lab Grown|IGI

1.21ct G SI1 Radiant Lab Grown Diamond

ID • G/SI1 • IGI LG534238077

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

Certificate IGI LG534238077

Diamond specifications and retailer prices

From £146 GBP
As of November 6, 2026
Save £607 GBP (81%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £802 GBP at B2C Jewels · As of October 26, 2026
View at B2C Jewels

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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG534238077 or 534238077. Listed at 18 retailers as of November 5, 2026, with a 416% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.21
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.4°
Pavilion angle30.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG534238077
Dimensions7.55 × 5.24 × 3.43 mm
L/W Ratio1.44
Culet sizePointed
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
7.55 mm5.24 mm1.21 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG534238077
Side View
Table 64.0%Crown 41.4°Girdle: Slightly ThickPavilion 30.1°Culet: NoneDepth 65.5%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: £802 GBP|Low: £146 GBP|High: £802 GBP|Avg: £394 GBP|+4.6%
B2C Jewels
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 11£146 GBP
Retailer 10£161 GBP
Retailer 3£218 GBP
Retailer 2£285 GBP
Retailer 8£295 GBP
Retailer 7£299 GBP
Retailer 9£459 GBP
Retailer 6£548 GBP
Retailer 4£628 GBP
Retailer 5£752 GBP
B2C Jewels£802 GBP

42 data points across 11 retailers

18 retailers£146 GBP to £752 GBP

Retailer 1
-
£125 GBP
Price last confirmed 33 days ago
A
Retailer 2
-
£146 GBP
View
Final sale: no returns
Retailer 3
-
£159 GBP
View
Price last confirmed 43 days ago
Retailer 4
-
£161 GBP
View
Price last confirmed 35 days ago
B+
Retailer 5
-
£218 GBP
View
A
Retailer 6
-
£285 GBP
View
A
Retailer 7
-
£295 GBP
View
A
Retailer 8
-
£299 GBP
View
B+
Retailer 9
-
£409 GBP
View
Retailer 10
-
£459 GBP
View
Price last confirmed 31 days ago
B
Retailer 11
-
£468 GBP
View
B+
Retailer 12
-
£493 GBP
View
B
Retailer 13
-
£529 GBP
View
B
Retailer 14
-
£548 GBP
View
B
Retailer 15
-
£559 GBP
View
B
Retailer 16
-
£628 GBP
View
B
Retailer 17
-
£752 GBP
View
Most Expensive
B2C Jewels
20884917 · Oct 26
£802 GBP
$1,074 USD
View
Price last confirmed 11 days ago
17 more retailers have this diamond
Prices start from £146 GBPSave up to £607 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
£146 GBP