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Cushion|Lab Grown|IGI

4.20ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG780662186

Shape and cutting style on the report: Antique cushion cut

Certificate IGI LG780662186

Diamond specifications and retailer prices

From $4,088 USD
As of October 29, 2026
Save $11,821 USD (74%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $15,909 USD at MOH London · As of October 29, 2026
View at MOH London

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 LG780662186 or 780662186. Listed at 10 retailers as of October 29, 2026, with prices from $4,088 to $15,909, a $11,821 spread on the same certified stone. MOH London lists it at $15,909. 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 angle36.6°
Pavilion angle41.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780662186
Dimensions10.92 × 8.47 × 5.81 mm
L/W Ratio1.29
Girdle conditionFaceted
Culet sizeLarge
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
10.92 mm8.47 mm4.20 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780662186
Side View
Table 53.0%Crown 36.6°Girdle: THK-VTKPavilion 41.9°Culet: LargeDepth 68.6%

Caratlytics Score

How it works →
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 29
Current: $15,909 USD|Low: $4,088 USD|High: $35,071 USD|Avg: $15,015 USD|-4.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
October 30, 2026
Retailer 8$4,088 USD
Retailer 15$6,195 USD
Retailer 14$6,546 USD
Retailer 3$6,968 USD
Retailer 11$8,468 USD
Retailer 12$8,682 USD
Retailer 10$8,920 USD
Retailer 9$9,055 USD
Retailer 13$9,568 USD
Retailer 6$12,060 USD
Retailer 2$13,016 USD
MOH London$15,909 USD
Retailer 4$22,740 USD
Retailer 7$29,684 USD
Retailer 5$35,071 USD

30 data points across 15 retailers

10 retailers$4,088 USD to $15,909 USD

A
Cheapest Retailer
-
$4,088 USD
A
Retailer 2
-
$6,195 USD
View
Final sale: no returns
A
Retailer 3
-
$6,546 USD
View
A
Retailer 4
-
$8,468 USD
View
A
Retailer 5
-
$8,682 USD
View
B+
Retailer 6
-
$8,920 USD
View
B+
Retailer 7
-
$9,055 USD
€8,624 EUR
View
B+
Retailer 8
-
$9,568 USD
View
B+
Retailer 9
-
$13,016 USD
View
Most Expensive
B
MOH London
LG780662186 · Oct 29
$15,909 USD
£12,527 GBP
View
9 more retailers have this diamond
Prices start from $4,088 USDSave up to $11,821 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
$4,088 USD