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Radiant|Lab Grown|IGI

1.21ct H VS1 Radiant Lab Grown Diamond

ID • H/VS1 • IGI LG510196409

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

Certificate IGI LG510196409

Diamond specifications and retailer prices

From £186 GBP
As of November 4, 2026
Save £1,597 GBP (90%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £1,783 GBP at Do Amore Diamonds · As of November 4, 2026
View at Do Amore Diamonds

About this 1.21ct lab-grown radiant diamond

This 1.21ct lab-grown radiant sits in the classic one-carat band, graded H colour (near-colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG510196409 or 510196409. Listed at 20 retailers as of November 4, 2026, with prices from £186 to £1,783, a £1,597 spread on the same certified stone. Do Amore Diamonds lists it at £1,783. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.21
Carat
H
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle42.5°
Pavilion angle37°
OriginLab Grown
Grading LabIGI
CertificateIGI LG510196409
Dimensions7.97 × 5.25 × 3.46 mm
L/W Ratio1.52
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.97 mm5.25 mm1.21 ctH / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG510196409
Side View
Table 65.0%Crown 42.5°Girdle: Slightly ThickPavilion 37°Culet: NoneDepth 65.9%

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: £1,783 GBP|Low: £178 GBP|High: £1,783 GBP|Avg: £587 GBP
Do Amore Diamonds
Retailer 2
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Retailer 18
November 4, 2026
Retailer 18£186 GBP
Retailer 5£207 GBP
Retailer 16£215 GBP
Retailer 3£230 GBP
Retailer 17£230 GBP
Retailer 10£271 GBP
Retailer 2£317 GBP
Retailer 7£386 GBP
Retailer 8£406 GBP
Retailer 11£427 GBP
Retailer 12£438 GBP
Retailer 15£707 GBP
Retailer 4£810 GBP
Retailer 6£817 GBP
Retailer 9£984 GBP
Retailer 13£1,018 GBP
Retailer 14£1,115 GBP
Do Amore Diamonds£1,783 GBP

38 data points across 18 retailers

20 retailers£186 GBP to £1,783 GBP

A
Cheapest Retailer
-
£186 GBP
A
Retailer 2
-
£207 GBP
View
Final sale: no returns
A
Retailer 3
-
£215 GBP
View
Retailer 4
-
£230 GBP
View
Price last confirmed 11 days ago
A
Retailer 5
-
£230 GBP
View
A
Retailer 6
-
£271 GBP
View
A
Retailer 7
-
£317 GBP
View
A
Retailer 8
-
£386 GBP
View
B+
Retailer 9
-
£406 GBP
View
B+
Retailer 10
-
£427 GBP
View
B+
Retailer 11
-
£438 GBP
View
B
Retailer 12
-
£646 GBP
View
B
Retailer 13
-
£707 GBP
View
B
Retailer 14
-
£810 GBP
View
B
Retailer 15
-
£817 GBP
View
B
Retailer 16
-
£941 GBP
View
B
Retailer 17
-
£984 GBP
View
B
Retailer 18
-
£1,018 GBP
View
B
Retailer 19
-
£1,115 GBP
View
Most Expensive
B
Do Amore Diamonds
27-A16030B2B · Nov 4
£1,783 GBP
$2,400 USD
View
19 more retailers have this diamond
Prices start from £186 GBPSave up to £1,597 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
£186 GBP