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Cushion|Lab Grown|IGI

6.29ct D IF Cushion Lab Grown Diamond

EX • D/IF • IGI LG828680591

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG828680591

Diamond specifications and retailer prices

From £13,450 GBP
$18,021 USD
As of October 26, 2026
Save £27,861 GBP (67%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £41,311 GBP at Wholesale Diamonds Direct · As of October 27, 2026
View at Wholesale Diamonds Direct

About this 6.29ct lab-grown cushion diamond

This 6.29ct lab-grown cushion sits in the over five carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG828680591 or 828680591. Listed at 12 retailers as of October 26, 2026, with prices from £13,450 to £41,311, a £27,861 spread on the same certified stone. Wholesale Diamonds Direct lists it at £41,311. 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

6.29
Carat
D
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle35.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG828680591
Dimensions12.23 × 9.91 × 6.52 mm
L/W Ratio1.23
Girdle conditionFaceted
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
12.23 mm9.91 mm6.29 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG828680591
Side View
Table 60.0%Crown 36.3°Girdle: MED-STKPavilion 35.5°Culet: NoneDepth 65.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 26
Current: £25,125 GBP|Low: £10,396 GBP|High: £41,311 GBP|Avg: £24,237 GBP|+0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Wholesale Diamonds Direct
October 31, 2026
Retailer 7£10,396 GBP
Retailer 10£13,450 GBP
Retailer 3£16,334 GBP
Retailer 8£18,377 GBP
Retailer 4£19,733 GBP
Retailer 6£23,359 GBP
Retailer 1£25,125 GBP
Retailer 2£26,728 GBP
Retailer 5£28,623 GBP
Retailer 9£36,235 GBP
Wholesale Diamonds Direct£41,311 GBP

17 data points across 11 retailers

12 retailers£13,450 GBP to £41,311 GBP

Retailer 1
-
£10,396 GBP
$13,930 USD
Price last confirmed 13 days ago
B+
Retailer 2
-
£13,450 GBP
$18,021 USD
View
B+
Retailer 3
-
£16,334 GBP
View
B+
Retailer 4
-
£18,377 GBP
$24,623 USD
View
B+
Retailer 5
-
£19,733 GBP
$26,440 USD
View
B+
Retailer 6
-
£23,359 GBP
View
B+
Retailer 7
-
£25,125 GBP
€32,062 EUR
View
B
Retailer 8
-
£26,569 GBP
$35,600 USD
View
B
Retailer 9
-
£26,728 GBP
$35,812 USD
View
B
Retailer 10
-
£28,623 GBP
ZAR 619,575 ZAR
View
B
Retailer 11
-
£36,235 GBP
$48,551 USD
View
Most Expensive
B
Wholesale Diamonds Direct
496695798 · Oct 27
£41,311 GBP
$55,352 USD
View
11 more retailers have this diamond
Prices start from £13,450 GBPSave up to £27,861 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.

B+
6.29ct Cushion
£13,450 GBP