Radiant|Lab Grown|IGI

1.21ct D VVS1 Radiant Lab Grown Diamond

EX • D/VVS1 • IGI LG731566581

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

Certificate IGI LG731566581

Diamond specifications and retailer prices

From £149 GBP
As of November 4, 2026
Save £762 GBP (84%) vs most expensive(unlock to see where)
29 retailers carry this diamond
Most expensive: £911 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 VVS1 clarity (very-very-slightly-included), with a top-tier cut grade and certified by IGI LG731566581 or 731566581. Listed at 29 retailers as of November 4, 2026, with prices from £149 to £911, a £762 spread on the same certified stone. Brilliant Earth lists it at £911. 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
VVS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.5°
Pavilion angle34.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG731566581
Dimensions5.18 × 5.18 × 3.41 mm
L/W Ratio1.00
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
5.18 mm5.18 mm1.21 ctD / VVS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG731566581
Side View
Table 64.0%Crown 43.5°Girdle: Slightly ThickPavilion 34.2°Culet: NoneDepth 65.8%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 4
Current: £911 GBP|Low: £149 GBP|High: £1,022 GBP|Avg: £492 GBP|-10.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 5, 2026
Retailer 12£149 GBP
Retailer 6£166 GBP
Retailer 3£261 GBP
Retailer 9£313 GBP
Retailer 8£318 GBP
Retailer 2£335 GBP
Retailer 7£450 GBP
Retailer 11£595 GBP
Retailer 4£693 GBP
Retailer 10£793 GBP
Retailer 5£859 GBP
Brilliant Earth£911 GBP

43 data points across 12 retailers

29 retailers£149 GBP to £911 GBP

A
Cheapest Retailer
-
£149 GBP
Retailer 2
-
£149 GBP
View
Price last confirmed 28 days ago
Retailer 3
-
£149 GBP
View
Price last confirmed 36 days ago
A
Retailer 4
-
£166 GBP
View
Final sale: no returns
Retailer 5
-
£173 GBP
View
Price last confirmed 39 days ago
Retailer 6
-
£182 GBP
View
Price last confirmed 37 days ago
Retailer 7
-
£184 GBP
View
Price last confirmed 33 days ago
A
Retailer 8
-
£218 GBP
View
B+
Retailer 9
-
£261 GBP
View
A
Retailer 10
-
£313 GBP
View
A
Retailer 11
-
£318 GBP
View
Retailer 12
-
£330 GBP
View
Price last confirmed 21 days ago
A
Retailer 13
-
£335 GBP
View
A
Retailer 14
-
£365 GBP
View
A
Retailer 15
-
£394 GBP
View
B+
Retailer 16
-
£430 GBP
View
B+
Retailer 17
-
£450 GBP
View
B+
Retailer 18
-
£593 GBP
View
Retailer 19
-
£593 GBP
View
Price last confirmed 36 days ago
Retailer 20
-
£593 GBP
View
Price last confirmed 26 days ago
B+
Retailer 21
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£595 GBP
View
B+
Retailer 22
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£628 GBP
View
B+
Retailer 23
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£633 GBP
View
B
Retailer 24
-
£661 GBP
View
Retailer 25
-
£693 GBP
View
Price last confirmed 31 days ago
Retailer 26
-
£793 GBP
View
Price last confirmed 18 days ago
B
Retailer 27
-
£859 GBP
View
B
Retailer 28
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£886 GBP
View
Most Expensive
B
Brilliant Earth
15998864A · Nov 4
£911 GBP
$1,230 USD
View
28 more retailers have this diamond
Prices start from £149 GBPSave up to £762 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
£149 GBP