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Cushion|Lab Grown|IGI

4.20ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG846664245

Certificate IGI LG846664245

Diamond specifications and retailer prices

From £4,697 GBP
$6,293 USD
As of October 30, 2026
Save £16,432 GBP (78%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £21,129 GBP at With Clarity · As of October 28, 2026
View at With Clarity

About this 4.2ct lab-grown cushion diamond

This 4.2ct 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 LG846664245 or 846664245. Listed at 4 retailers as of October 28, 2026, with prices from £4,697 to £21,129, a £16,432 spread on the same certified stone. With Clarity lists it at £21,129. 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

4.20
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG846664245
Dimensions11.14 × 8.37 × 5.66 mm
L/W Ratio1.33
Top View
11.14 mm8.37 mm4.20 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG846664245
Side View
Table 58.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 67.6%

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: £4,697 GBP|Low: £4,697 GBP|High: £21,726 GBP|Avg: £11,738 GBP|-0.7%
Retailer 1
Retailer 2
Retailer 3
With Clarity
October 30, 2026
Retailer 1£4,697 GBP
Retailer 3£7,030 GBP
Retailer 2£7,607 GBP
With Clarity£21,129 GBP

5 data points across 4 retailers

4 retailers£4,697 GBP to £21,129 GBP

A
Cheapest Retailer
-
£4,697 GBP
$6,293 USD
B+
Retailer 2
-
£7,030 GBP
€8,971 EUR
View
B+
Retailer 3
-
£7,607 GBP
View
Most Expensive
B
With Clarity
846664245 · Oct 28
£21,129 GBP
$28,310 USD
View
3 more retailers have this diamond
Prices start from £4,697 GBPSave up to £16,432 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
4.20ct Cushion
£4,697 GBP