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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 $7,269 NZD
$4,097 USD
As of October 29, 2026
Save $15,878 NZD (69%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $23,148 NZD at Frank Darling · As of October 31, 2026
View at Frank Darling

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 $7,269 to $23,148, a $15,878 spread on the same certified stone. Frank Darling lists it at $23,148. 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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: $23,148 NZD|Low: $7,269 NZD|High: $62,371 NZD|Avg: $25,286 NZD|-42.1%
Frank Darling
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
November 1, 2026
Retailer 14$7,269 NZD
Retailer 13$7,617 NZD
Retailer 15$11,017 NZD
Retailer 12$11,183 NZD
Retailer 10$11,631 NZD
Retailer 3$12,393 NZD
Retailer 8$13,054 NZD
Retailer 11$15,064 NZD
Retailer 9$15,990 NZD
Retailer 2$19,271 NZD
Retailer 6$21,449 NZD
Frank Darling$23,148 NZD
Retailer 4$40,454 NZD
Retailer 7$52,744 NZD
Retailer 5$62,371 NZD

33 data points across 15 retailers

10 retailers$7,269 NZD to $23,148 NZD

A
Cheapest Retailer
-
$7,269 NZD
$4,097 USD
A
Retailer 2
-
$7,617 NZD
$4,293 USD
View
A
Retailer 3
-
$11,017 NZD
$6,209 USD
View
Final sale: no returns
A
Retailer 4
-
$11,183 NZD
$6,303 USD
View
A
Retailer 5
-
$11,631 NZD
$6,555 USD
View
A
Retailer 6
-
$13,054 NZD
$7,357 USD
View
A
Retailer 7
-
$15,064 NZD
$8,490 USD
View
B+
Retailer 8
-
$15,990 NZD
€8,583 EUR
View
B+
Retailer 9
-
$19,271 NZD
£8,552 GBP
View
Most Expensive
B+
Frank Darling
CR16-4EL · Oct 31
$23,148 NZD
$13,046 USD
View
9 more retailers have this diamond
Prices start from $7,269 NZDSave up to $15,878 NZD

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
$7,269 NZD