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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 €3,667 EUR
$4,097 USD
As of October 29, 2026
Save €10,606 EUR (74%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: €14,273 EUR 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 €3,667 to €14,273, a €10,606 spread on the same certified stone. MOH London lists it at €14,273. 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
Colour
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

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: €14,273 EUR|Low: €3,667 EUR|High: €31,465 EUR|Avg: €12,816 EUR|-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 31, 2026
Retailer 13€3,667 EUR
Retailer 11€3,843 EUR
Retailer 15€5,558 EUR
Retailer 10€5,642 EUR
Retailer 8€5,867 EUR
Retailer 3€6,252 EUR
Retailer 14€7,597 EUR
Retailer 9€7,599 EUR
Retailer 2€8,067 EUR
Retailer 6€10,820 EUR
Retailer 12€11,677 EUR
MOH London€14,273 EUR
Retailer 4€20,408 EUR
Retailer 7€26,608 EUR
Retailer 5€31,465 EUR

32 data points across 15 retailers

10 retailers€3,667 EUR to €14,273 EUR

A
Cheapest Retailer
-
€3,667 EUR
$4,097 USD
A
Retailer 2
-
€3,843 EUR
$4,293 USD
View
A
Retailer 3
-
€5,558 EUR
$6,209 USD
View
Final sale: no returns
A
Retailer 4
-
€5,642 EUR
$6,303 USD
View
A
Retailer 5
-
€5,867 EUR
$6,555 USD
View
A
Retailer 6
-
€7,597 EUR
$8,487 USD
View
A
Retailer 7
-
€7,599 EUR
$8,490 USD
View
B+
Retailer 8
-
€8,067 EUR
View
B+
Retailer 9
-
€11,677 EUR
$13,046 USD
View
Most Expensive
B+
MOH London
LG780662156 · Oct 29
€14,273 EUR
£12,556 GBP
View
9 more retailers have this diamond
Prices start from €3,667 EURSave up to €10,606 EUR

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
€3,667 EUR