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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 $5,832 AUD
$4,097 USD
As of October 29, 2026
Save $16,868 AUD (74%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $22,701 AUD 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 $5,832 to $22,701, a $16,868 spread on the same certified stone. MOH London lists it at $22,701. 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: $22,701 AUD|Low: $5,832 AUD|High: $50,043 AUD|Avg: $20,383 AUD|-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$5,832 AUD
Retailer 11$6,112 AUD
Retailer 15$8,839 AUD
Retailer 10$8,973 AUD
Retailer 8$9,332 AUD
Retailer 3$9,944 AUD
Retailer 14$12,082 AUD
Retailer 9$12,086 AUD
Retailer 2$12,830 AUD
Retailer 6$17,209 AUD
Retailer 12$18,572 AUD
MOH London$22,701 AUD
Retailer 4$32,458 AUD
Retailer 7$42,319 AUD
Retailer 5$50,043 AUD

32 data points across 15 retailers

10 retailers$5,832 AUD to $22,701 AUD

A
Cheapest Retailer
-
$5,832 AUD
$4,097 USD
A
Retailer 2
-
$6,112 AUD
$4,293 USD
View
A
Retailer 3
-
$8,839 AUD
$6,209 USD
View
Final sale: no returns
A
Retailer 4
-
$8,973 AUD
$6,303 USD
View
A
Retailer 5
-
$9,332 AUD
$6,555 USD
View
A
Retailer 6
-
$12,082 AUD
$8,487 USD
View
A
Retailer 7
-
$12,086 AUD
$8,490 USD
View
B+
Retailer 8
-
$12,830 AUD
€8,583 EUR
View
B+
Retailer 9
-
$18,572 AUD
$13,046 USD
View
Most Expensive
B+
MOH London
LG780662156 · Oct 29
$22,701 AUD
£12,556 GBP
View
9 more retailers have this diamond
Prices start from $5,832 AUDSave up to $16,868 AUD

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
$5,832 AUD