Cushion|Lab Grown|IGI

4.20ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG846663139

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG846663139

Diamond specifications and retailer prices

From $4,385 USD
£3,453 GBP
As of October 30, 2026
Save $25,090 USD (85%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $29,475 USD 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 LG846663139 or 846663139. Listed at 9 retailers as of October 28, 2026, with prices from $4,385 to $29,475, a $25,090 spread on the same certified stone. With Clarity lists it at $29,475. 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
Color
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.7°
Pavilion angle35.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG846663139
Dimensions11.69 × 8.30 × 5.51 mm
L/W Ratio1.41
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
11.69 mm8.30 mm4.20 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG846663139
Side View
Table 61.0%Crown 31.7°Girdle: STK-THKPavilion 35.4°Culet: NoneDepth 66.4%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $4,385 USD|Low: $4,055 USD|High: $29,475 USD|Avg: $10,424 USD|+8.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
With Clarity
October 30, 2026
Retailer 1$4,385 USD
Retailer 3$5,020 USD
Retailer 4$6,379 USD
Retailer 6$7,531 USD
Retailer 2$9,616 USD
Retailer 7$10,085 USD
Retailer 5$10,415 USD
With Clarity$29,475 USD

6 data points across 8 retailers

9 retailers$4,385 USD to $29,475 USD

A
Cheapest Retailer
-
$4,385 USD
£3,453 GBP
A
Retailer 2
-
$5,020 USD
View
A
Retailer 3
-
$6,379 USD
View
A
Retailer 4
-
$7,531 USD
View
B+
Retailer 5
-
$9,616 USD
€9,158 EUR
View
B+
Retailer 6
-
$10,085 USD
£7,941 GBP
View
B+
Retailer 7
-
$10,415 USD
View
B
Retailer 8
-
$22,060 USD
View
Most Expensive
B
With Clarity
846663139 · Oct 28
$29,475 USD
View
8 more retailers have this diamond
Prices start from $4,385 USDSave up to $25,090 USD

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
$4,385 USD