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Radiant|Lab Grown|IGI

1.21ct D IF Radiant Lab Grown Diamond

EX • D/IF • IGI LG758550096

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

Certificate IGI LG758550096

Diamond specifications and retailer prices

From £274 GBP
As of November 4, 2026
Save £1,030 GBP (79%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £1,359 GBP at Rare Carat · As of October 18, 2026
View at Rare Carat

About this 1.21ct lab-grown radiant diamond

This 1.21ct lab-grown radiant sits in the classic one-carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG758550096 or 758550096. Listed at 9 retailers as of November 4, 2026, with a 376% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
D
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle39.8°
Pavilion angle35.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG758550096
Dimensions7.78 × 5.36 × 3.54 mm
L/W Ratio1.45
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
7.78 mm5.36 mm1.21 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG758550096
Side View
Table 62.0%Crown 39.8°Girdle: MediumPavilion 35.8°Culet: NoneDepth 66.0%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 4
Current: £1,359 GBP|Low: £274 GBP|High: £1,770 GBP|Avg: £710 GBP|-1.6%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 4, 2026
Retailer 4£274 GBP
Retailer 7£284 GBP
Retailer 6£372 GBP
Retailer 2£391 GBP
Retailer 9£439 GBP
Retailer 8£807 GBP
Retailer 3£847 GBP
Retailer 5£1,304 GBP
Rare Carat£1,359 GBP

44 data points across 9 retailers

9 retailers£274 GBP to £1,304 GBP

A
Cheapest Retailer
-
£274 GBP
A
Retailer 2
-
£284 GBP
View
A
Retailer 3
-
£372 GBP
View
A
Retailer 4
-
£391 GBP
View
A
Retailer 5
-
£439 GBP
View
B+
Retailer 6
-
£807 GBP
View
B+
Retailer 7
-
£847 GBP
View
B
Retailer 8
-
£1,304 GBP
View
Most Expensive
Rare Carat
BJ-107A · Oct 18
£1,359 GBP
$1,835 USD
View
Price last confirmed 16 days ago
8 more retailers have this diamond
Prices start from £274 GBPSave up to £1,030 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
£274 GBP