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Cushion|Lab Grown|IGI

4.21ct D FL Cushion Lab Grown Diamond

VG • D/FL • IGI LG784642485

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG784642485

Diamond specifications and retailer prices

From £3,041 GBP
$4,074 USD
As of October 30, 2026
Save £15,931 GBP (84%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £18,972 GBP at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 4.21ct lab-grown cushion diamond

This 4.21ct lab-grown cushion sits in the three to five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG784642485 or 784642485. Listed at 11 retailers as of October 30, 2026, with prices from £3,041 to £18,972, a £15,931 spread on the same certified stone. Do Amore Diamonds lists it at £18,972. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

4.21
Carat
D
Colour
FL
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.2°
Pavilion angle39°
OriginLab Grown
Grading LabIGI
CertificateIGI LG784642485
Dimensions9.24 × 9.21 × 6.34 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
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
9.24 mm9.21 mm4.21 ctD / FL
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG784642485
Side View
Table 61.0%Crown 37.2°Girdle: STK-THKPavilion 39°Culet: NoneDepth 68.8%

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: £18,972 GBP|Low: £3,041 GBP|High: £24,308 GBP|Avg: £8,053 GBP|-22.0%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 31, 2026
Retailer 3£3,041 GBP
Retailer 6£3,314 GBP
Retailer 5£3,468 GBP
Retailer 10£4,199 GBP
Retailer 8£4,994 GBP
Retailer 2£6,054 GBP
Retailer 9£6,090 GBP
Retailer 7£7,605 GBP
Retailer 4£9,740 GBP
Do Amore Diamonds£18,972 GBP

28 data points across 10 retailers

11 retailers£3,041 GBP to £18,972 GBP

A
Cheapest Retailer
-
£3,041 GBP
$4,074 USD
A
Retailer 2
-
£3,314 GBP
$4,440 USD
View
A
Retailer 3
-
£3,468 GBP
$4,647 USD
View
A
Retailer 4
-
£4,199 GBP
$5,626 USD
View
Final sale: no returns
A
Retailer 5
-
£4,994 GBP
$6,691 USD
View
A
Retailer 6
-
£6,054 GBP
€7,725 EUR
View
Retailer 7
-
£6,090 GBP
$8,160 USD
View
Price last confirmed 12 days ago
B+
Retailer 8
-
£7,605 GBP
View
B+
Retailer 9
-
£9,740 GBP
$13,050 USD
View
B
Retailer 10
-
£14,944 GBP
$20,023 USD
View
Most Expensive
B
Do Amore Diamonds
27-36DC3358C · Oct 31
£18,972 GBP
$25,420 USD
View
10 more retailers have this diamond
Prices start from £3,041 GBPSave up to £15,931 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
4.21ct Cushion
£3,041 GBP