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Radiant|Lab Grown|IGI

1.21ct D IF Radiant Lab Grown Diamond

EX • D/IF • IGI LG799677049

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

Certificate IGI LG799677049

Diamond specifications and retailer prices

From £181 GBP
As of November 4, 2026
Save £810 GBP (82%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £1,374 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 LG799677049 or 799677049. Listed at 21 retailers as of November 4, 2026, with a 446% 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 angle46.6°
Pavilion angle30.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG799677049
Dimensions8.05 × 5.11 × 3.33 mm
L/W Ratio1.58
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
8.05 mm5.11 mm1.21 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG799677049
Side View
Table 62.0%Crown 46.6°Girdle: Slightly ThickPavilion 30.7°Culet: NoneDepth 65.2%

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: Nov 4
Current: £1,374 GBP|Low: £181 GBP|High: £1,396 GBP|Avg: £528 GBP|-1.6%
Rare Carat
Retailer 2
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November 4, 2026
Retailer 4£181 GBP
Retailer 7£203 GBP
Retailer 19£211 GBP
Retailer 8£225 GBP
Retailer 22£225 GBP
Retailer 3£256 GBP
Retailer 15£370 GBP
Retailer 18£374 GBP
Retailer 9£379 GBP
Retailer 16£389 GBP
Retailer 6£401 GBP
Retailer 2£424 GBP
Retailer 13£552 GBP
Retailer 21£568 GBP
Retailer 5£724 GBP
Retailer 12£727 GBP
Retailer 20£727 GBP
Retailer 14£763 GBP
Retailer 10£880 GBP
Retailer 17£903 GBP
Retailer 11£991 GBP
Rare Carat£1,374 GBP

41 data points across 22 retailers

21 retailers£181 GBP to £991 GBP

A
Cheapest Retailer
-
£181 GBP
A
Retailer 2
-
£203 GBP
View
Final sale: no returns
A
Retailer 3
-
£211 GBP
View
Retailer 4
-
£225 GBP
View
Price last confirmed 10 days ago
A
Retailer 5
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£225 GBP
View
A
Retailer 6
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£256 GBP
View
A
Retailer 7
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£374 GBP
View
A
Retailer 8
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£379 GBP
View
A
Retailer 9
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£389 GBP
View
A
Retailer 10
-
£401 GBP
View
A
Retailer 11
-
£424 GBP
View
B+
Retailer 12
-
£552 GBP
View
B+
Retailer 13
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£568 GBP
View
B+
Retailer 14
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£724 GBP
View
B+
Retailer 15
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£727 GBP
View
B+
Retailer 16
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£727 GBP
View
B+
Retailer 17
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£763 GBP
View
B
Retailer 18
-
£880 GBP
View
B+
Retailer 19
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£903 GBP
View
B
Retailer 20
-
£991 GBP
View
Most Expensive
Rare Carat
A10-142A · Oct 18
£1,374 GBP
$1,855 USD
View
Price last confirmed 16 days ago
20 more retailers have this diamond
Prices start from £181 GBPSave up to £810 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
£181 GBP