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Cushion|Lab Grown|IGI

1.29ct D VS1 Cushion Lab Grown Diamond

EX • D/VS1 • IGI LG646487136

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG646487136

Diamond specifications and retailer prices

From £203 GBP
As of November 6, 2026
Save £790 GBP (80%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £1,031 GBP at Brilliant Earth · As of October 8, 2026
View at Brilliant Earth

About this 1.29ct lab-grown cushion diamond

This 1.29ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG646487136 or 646487136. Listed at 15 retailers as of November 6, 2026, with a 389% 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

1.29
Carat
D
Colour
VS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle39.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG646487136
Dimensions6.28 × 6.28 × 4.18 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.28 mm6.28 mm1.29 ctD / VS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG646487136
Side View
Table 63.0%Crown 36.5°Girdle: MED-STKPavilion 39.2°Culet: NoneDepth 66.6%

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 6
Current: £1,031 GBP|Low: £175 GBP|High: £1,031 GBP|Avg: £515 GBP
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
Retailer 14
Retailer 15
November 6, 2026
Retailer 12£203 GBP
Retailer 6£214 GBP
Retailer 2£299 GBP
Retailer 3£330 GBP
Retailer 15£371 GBP
Retailer 13£378 GBP
Retailer 9£398 GBP
Retailer 8£421 GBP
Retailer 7£453 GBP
Retailer 5£524 GBP
Retailer 4£542 GBP
Retailer 11£762 GBP
Retailer 10£899 GBP
Retailer 14£994 GBP
Brilliant Earth£1,031 GBP

39 data points across 15 retailers

15 retailers£203 GBP to £994 GBP

A
Cheapest Retailer
-
£203 GBP
Final sale: no returns
Retailer 2
-
£214 GBP
View
Price last confirmed 13 days ago
A
Retailer 3
-
£299 GBP
View
A
Retailer 4
-
£330 GBP
View
A
Retailer 5
-
£371 GBP
View
A
Retailer 6
-
£378 GBP
View
A
Retailer 7
-
£398 GBP
View
B+
Retailer 8
-
£421 GBP
View
B+
Retailer 9
-
£453 GBP
View
Retailer 10
-
£524 GBP
View
Price last confirmed 11 days ago
Retailer 11
-
£542 GBP
View
Price last confirmed 10 days ago
B
Retailer 12
-
£762 GBP
View
B
Retailer 13
-
£899 GBP
View
B
Retailer 14
-
£994 GBP
View
Most Expensive
Brilliant Earth
11432608A · Oct 8
£1,031 GBP
$1,380 USD
View
Price last confirmed 30 days ago
14 more retailers have this diamond
Prices start from £203 GBPSave up to £790 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
1.29ct Cushion
£203 GBP