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Radiant|Lab Grown|IGI

1.21ct D IF Radiant Lab Grown Diamond

EX • D/IF • IGI LG780696509

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

Certificate IGI LG780696509

Diamond specifications and retailer prices

From £173 GBP
As of November 4, 2026
Save £1,286 GBP (88%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £1,459 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 D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG780696509 or 780696509. Listed at 21 retailers as of November 4, 2026, with prices from £173 to £1,459, a £1,286 spread on the same certified stone. Brilliant Earth lists it at £1,459. 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 angle28°
Pavilion angle35.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780696509
Dimensions7.62 × 5.24 × 3.48 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
7.62 mm5.24 mm1.21 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780696509
Side View
Table 62.0%Crown 28°Girdle: MediumPavilion 35.5°Culet: NoneDepth 66.4%

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: £1,459 GBP|Low: £166 GBP|High: £1,822 GBP|Avg: £524 GBP|-19.9%
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
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Retailer 16
November 4, 2026
Retailer 15£173 GBP
Retailer 8£193 GBP
Retailer 5£201 GBP
Retailer 6£215 GBP
Retailer 16£215 GBP
Retailer 12£356 GBP
Retailer 4£364 GBP
Retailer 10£370 GBP
Retailer 7£392 GBP
Retailer 2£401 GBP
Retailer 9£525 GBP
Retailer 3£690 GBP
Retailer 14£692 GBP
Retailer 11£859 GBP
Retailer 13£1,367 GBP
Brilliant Earth£1,459 GBP

44 data points across 16 retailers

21 retailers£173 GBP to £1,459 GBP

A
Cheapest Retailer
-
£173 GBP
A
Retailer 2
-
£193 GBP
View
Final sale: no returns
A
Retailer 3
-
£201 GBP
View
Retailer 4
-
£215 GBP
View
Price last confirmed 10 days ago
A
Retailer 5
-
£215 GBP
View
A
Retailer 6
-
£237 GBP
View
A
Retailer 7
-
£356 GBP
View
A
Retailer 8
-
£364 GBP
View
A
Retailer 9
-
£370 GBP
View
A
Retailer 10
-
£392 GBP
View
A
Retailer 11
-
£401 GBP
View
A
Retailer 12
-
£525 GBP
View
B+
Retailer 13
-
£565 GBP
View
B+
Retailer 14
-
£690 GBP
View
B+
Retailer 15
-
£692 GBP
View
B+
Retailer 16
-
£693 GBP
View
B+
Retailer 17
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£728 GBP
View
B+
Retailer 18
-
£859 GBP
View
B
Retailer 19
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£963 GBP
View
Retailer 20
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£1,367 GBP
View
Price last confirmed 17 days ago
Most Expensive
B
Brilliant Earth
19340393A · Nov 4
£1,459 GBP
$1,970 USD
View
20 more retailers have this diamond
Prices start from £173 GBPSave up to £1,286 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
£173 GBP