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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 $5,238 SGD
$4,097 USD
As of October 29, 2026
Save $15,148 SGD (74%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $20,386 SGD 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 $5,238 to $20,386, a $15,148 spread on the same certified stone. MOH London lists it at $20,386. 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

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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: $20,386 SGD|Low: $5,238 SGD|High: $44,939 SGD|Avg: $17,691 SGD|-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 31, 2026
Retailer 12$5,238 SGD
Retailer 10$5,488 SGD
Retailer 16$7,938 SGD
Retailer 9$8,058 SGD
Retailer 8$8,757 SGD
Retailer 3$8,930 SGD
Retailer 14$10,850 SGD
Retailer 2$10,854 SGD
Retailer 13$11,603 SGD
Retailer 15$12,260 SGD
Retailer 6$15,454 SGD
Retailer 11$16,678 SGD
MOH London$20,386 SGD
Retailer 4$29,148 SGD
Retailer 7$38,003 SGD
Retailer 5$44,939 SGD

32 data points across 16 retailers

10 retailers$5,238 SGD to $20,386 SGD

A
Cheapest Retailer
-
$5,238 SGD
$4,097 USD
A
Retailer 2
-
$5,488 SGD
$4,293 USD
View
A
Retailer 3
-
$7,938 SGD
$6,209 USD
View
Final sale: no returns
A
Retailer 4
-
$8,058 SGD
$6,303 USD
View
A
Retailer 5
-
$10,850 SGD
$8,487 USD
View
B+
Retailer 6
-
$10,854 SGD
$8,490 USD
View
B+
Retailer 7
-
$11,603 SGD
€8,644 EUR
View
B+
Retailer 8
-
$12,260 SGD
$9,590 USD
View
B+
Retailer 9
-
$16,678 SGD
$13,046 USD
View
Most Expensive
B+
MOH London
LG780662156 · Oct 29
$20,386 SGD
£12,556 GBP
View
9 more retailers have this diamond
Prices start from $5,238 SGDSave up to $15,148 SGD

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
$5,238 SGD