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Cushion|Lab Grown|IGI

6.31ct D VS1 Cushion Lab Grown Diamond

EX • D/VS1 • IGI LG629404672

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG629404672

Diamond specifications and retailer prices

From £1,243 GBP
As of October 26, 2026
Save £2,900 GBP (70%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £9,365 GBP at Queensmith · As of October 9, 2026
View at Queensmith

About this 6.31ct lab-grown cushion diamond

This 6.31ct lab-grown cushion sits in the over five carat band, graded D colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG629404672 or 629404672. Listed at 13 retailers as of October 26, 2026, with a 233% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

6.31
Carat
D
Colour
VS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.5°
Pavilion angle32.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG629404672
Dimensions10.44 × 9.95 × 6.69 mm
L/W Ratio1.05
Girdle conditionFaceted
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
10.44 mm9.95 mm6.31 ctD / VS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG629404672
Side View
Table 64.0%Crown 40.5°Girdle: MED-THKPavilion 32.1°Culet: NoneDepth 67.2%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 26
Current: £1,243 GBP|Low: £1,138 GBP|High: £4,439 GBP|Avg: £2,400 GBP|-7.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
October 26, 2026
Retailer 12£1,138 GBP
Retailer 1£1,243 GBP
Retailer 5£1,261 GBP
Retailer 4£1,295 GBP
Retailer 8£1,443 GBP
Retailer 6£1,690 GBP
Retailer 9£1,862 GBP
Retailer 7£2,259 GBP
Retailer 10£2,764 GBP
Retailer 11£2,844 GBP
Retailer 13£3,176 GBP
Retailer 3£3,621 GBP
Retailer 2£4,143 GBP

40 data points across 13 retailers

13 retailers£1,243 GBP to £4,143 GBP

A
Cheapest Retailer
-
£1,243 GBP
Retailer 2
-
£1,261 GBP
$1,690 USD
View
Price last confirmed 18 days ago
A
Retailer 3
-
£1,295 GBP
$1,735 USD
View
A
Retailer 4
-
£1,443 GBP
$1,933 USD
View
A
Retailer 5
-
£1,690 GBP
View
Retailer 6
-
£1,862 GBP
$2,495 USD
View
Price last confirmed 8 days ago
A
Retailer 7
-
£2,259 GBP
ZAR 48,905 ZAR
View
B+
Retailer 8
-
£2,764 GBP
$3,703 USD
View
B+
Retailer 9
-
£2,844 GBP
View
B+
Retailer 10
-
£3,176 GBP
$4,256 USD
View
Retailer 11
-
£3,621 GBP
View
Price last confirmed 10 days ago
B
Retailer 12
-
£4,143 GBP
$5,551 USD
View
Most Expensive
Queensmith
LG629404672 · Oct 9
£9,365 GBP
View
Price last confirmed 21 days ago
12 more retailers have this diamond
Prices start from £1,243 GBPSave up to £2,900 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
6.31ct Cushion
£1,243 GBP