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Cushion|Lab Grown|IGI

4.29ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG821641156

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG821641156

Diamond specifications and retailer prices

From £3,603 GBP
$4,828 USD
As of October 30, 2026
Save £11,522 GBP (76%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £15,125 GBP at With Clarity · As of October 31, 2026
View at With Clarity

About this 4.29ct lab-grown cushion diamond

This 4.29ct lab-grown cushion sits in the three to five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG821641156 or 821641156. Listed at 11 retailers as of October 30, 2026, with prices from £3,603 to £15,125, a £11,522 spread on the same certified stone. With Clarity lists it at £15,125. 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

4.29
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle36.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG821641156
Dimensions10.98 × 8.67 × 5.69 mm
L/W Ratio1.27
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
10.98 mm8.67 mm4.29 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG821641156
Side View
Table 61.0%Crown 36.3°Girdle: MED-STKPavilion 36.4°Culet: NoneDepth 65.6%

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 30
Current: £4,753 GBP|Low: £3,603 GBP|High: £20,694 GBP|Avg: £9,537 GBP|-5.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
With Clarity
October 31, 2026
Retailer 3£3,603 GBP
Retailer 1£4,753 GBP
Retailer 7£4,767 GBP
Retailer 5£4,950 GBP
Retailer 8£6,273 GBP
Retailer 2£6,441 GBP
Retailer 9£8,474 GBP
Retailer 4£9,919 GBP
Retailer 10£10,988 GBP
Retailer 6£13,617 GBP
With Clarity£15,125 GBP

41 data points across 11 retailers

11 retailers£3,603 GBP to £15,125 GBP

A
Cheapest Retailer
-
£3,603 GBP
$4,828 USD
A
Retailer 2
-
£4,753 GBP
$6,368 USD
View
A
Retailer 3
-
£4,767 GBP
HK$49,900 HKD
View
A
Retailer 4
-
£4,950 GBP
View
A
Retailer 5
-
£6,273 GBP
€8,005 EUR
View
A
Retailer 6
-
£6,441 GBP
$8,630 USD
View
B+
Retailer 7
-
£8,474 GBP
View
B+
Retailer 8
-
£9,919 GBP
$13,290 USD
View
B+
Retailer 9
-
£10,988 GBP
$14,723 USD
View
B+
Retailer 10
-
£13,617 GBP
$18,245 USD
View
Most Expensive
B
With Clarity
821641156 · Oct 31
£15,125 GBP
$20,266 USD
View
10 more retailers have this diamond
Prices start from £3,603 GBPSave up to £11,522 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
4.29ct Cushion
£3,603 GBP