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Cushion|Lab Grown|IGI

4.21ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG780662156

Shape and cutting style on the report: Antique cushion cut

Certificate IGI LG780662156

Diamond specifications and retailer prices

From $4,097 USD
As of October 29, 2026
Save $11,849 USD (74%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $15,946 USD at MOH London · As of October 29, 2026
View at MOH London

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 top-tier cut grade and certified by IGI LG780662156 or 780662156. Listed at 10 retailers as of October 29, 2026, with prices from $4,097 to $15,946, a $11,849 spread on the same certified stone. MOH London lists it at $15,946. 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

4.21
Carat
D
Color
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.5°
Pavilion angle42.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780662156
Dimensions10.81 × 8.68 × 5.88 mm
L/W Ratio1.25
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
10.81 mm8.68 mm4.21 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780662156
Side View
Table 56.0%Crown 36.5°Girdle: STK-THKPavilion 42.7°Culet: LargeDepth 67.7%

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 29
Current: $15,946 USD|Low: $4,097 USD|High: $35,153 USD|Avg: $14,460 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
Retailer 16
October 30, 2026
Retailer 9$4,097 USD
Retailer 16$6,209 USD
Retailer 15$6,561 USD
Retailer 8$6,850 USD
Retailer 3$6,985 USD
Retailer 12$8,487 USD
Retailer 13$8,702 USD
Retailer 11$8,940 USD
Retailer 10$9,076 USD
Retailer 14$9,590 USD
Retailer 6$12,089 USD
Retailer 2$13,046 USD
MOH London$15,946 USD
Retailer 4$22,800 USD
Retailer 7$29,727 USD
Retailer 5$35,153 USD

30 data points across 16 retailers

10 retailers$4,097 USD to $15,946 USD

A
Cheapest Retailer
-
$4,097 USD
A
Retailer 2
-
$6,209 USD
View
Final sale: no returns
A
Retailer 3
-
$6,561 USD
View
A
Retailer 4
-
$8,487 USD
View
A
Retailer 5
-
$8,702 USD
View
B+
Retailer 6
-
$8,940 USD
View
B+
Retailer 7
-
$9,076 USD
€8,644 EUR
View
B+
Retailer 8
-
$9,590 USD
View
B+
Retailer 9
-
$13,046 USD
View
Most Expensive
B+
MOH London
LG780662156 · Oct 29
$15,946 USD
£12,556 GBP
View
9 more retailers have this diamond
Prices start from $4,097 USDSave up to $11,849 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
4.21ct Cushion
$4,097 USD