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Cushion|Lab Grown|IGI

4.20ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG780662186

Shape and cutting style on the report: Antique cushion cut

Certificate IGI LG780662186

Diamond specifications and retailer prices

From $7,253 NZD
$4,088 USD
As of October 29, 2026
Save $20,975 NZD (74%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $28,228 NZD at MOH London · As of October 29, 2026
View at MOH London

About this 4.2ct lab-grown cushion diamond

This 4.2ct 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 LG780662186 or 780662186. Listed at 10 retailers as of October 29, 2026, with prices from $7,253 to $28,228, a $20,975 spread on the same certified stone. MOH London lists it at $28,228. 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

4.20
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.6°
Pavilion angle41.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780662186
Dimensions10.92 × 8.47 × 5.81 mm
L/W Ratio1.29
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
10.92 mm8.47 mm4.20 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780662186
Side View
Table 53.0%Crown 36.6°Girdle: THK-VTKPavilion 41.9°Culet: LargeDepth 68.6%

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: $28,228 NZD|Low: $7,253 NZD|High: $62,226 NZD|Avg: $25,348 NZD|-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$7,253 NZD
Retailer 11$7,601 NZD
Retailer 15$10,992 NZD
Retailer 10$11,159 NZD
Retailer 8$11,604 NZD
Retailer 3$12,363 NZD
Retailer 14$15,025 NZD
Retailer 9$15,028 NZD
Retailer 2$15,953 NZD
Retailer 6$21,398 NZD
Retailer 12$23,094 NZD
MOH London$28,228 NZD
Retailer 4$40,348 NZD
Retailer 7$52,668 NZD
Retailer 5$62,226 NZD

32 data points across 15 retailers

10 retailers$7,253 NZD to $28,228 NZD

A
Cheapest Retailer
-
$7,253 NZD
$4,088 USD
A
Retailer 2
-
$7,601 NZD
$4,284 USD
View
A
Retailer 3
-
$10,992 NZD
$6,195 USD
View
Final sale: no returns
A
Retailer 4
-
$11,159 NZD
$6,289 USD
View
A
Retailer 5
-
$11,604 NZD
$6,540 USD
View
A
Retailer 6
-
$15,025 NZD
$8,468 USD
View
A
Retailer 7
-
$15,028 NZD
$8,470 USD
View
B+
Retailer 8
-
$15,953 NZD
€8,563 EUR
View
B+
Retailer 9
-
$23,094 NZD
$13,016 USD
View
Most Expensive
B
MOH London
LG780662186 · Oct 29
$28,228 NZD
£12,527 GBP
View
9 more retailers have this diamond
Prices start from $7,253 NZDSave up to $20,975 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
4.20ct Cushion
$7,253 NZD