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Cushion|Lab Grown|IGI

4.20ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG846663139

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG846663139

Diamond specifications and retailer prices

From $7,079 NZD
£3,142 GBP
As of November 1, 2026
Save $41,345 NZD (85%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $48,424 NZD at With Clarity · As of October 31, 2026
View at With Clarity

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 LG846663139 or 846663139. Listed at 9 retailers as of October 31, 2026, with prices from $7,079 to $48,424, a $41,345 spread on the same certified stone. With Clarity lists it at $48,424. 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 angle31.7°
Pavilion angle35.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG846663139
Dimensions11.69 × 8.30 × 5.51 mm
L/W Ratio1.41
Girdle conditionFaceted
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
11.69 mm8.30 mm4.20 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG846663139
Side View
Table 61.0%Crown 31.7°Girdle: STK-THKPavilion 35.4°Culet: NoneDepth 66.4%

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: Nov 1
Current: $7,079 NZD|Low: $7,079 NZD|High: $52,297 NZD|Avg: $18,589 NZD|-1.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
With Clarity
November 1, 2026
Retailer 1$7,079 NZD
Retailer 2$8,588 NZD
Retailer 4$11,198 NZD
Retailer 7$13,362 NZD
Retailer 5$16,942 NZD
Retailer 6$17,110 NZD
Retailer 8$17,894 NZD
Retailer 3$24,077 NZD
With Clarity$48,424 NZD

8 data points across 9 retailers

9 retailers$7,079 NZD to $48,424 NZD

A
Cheapest Retailer
-
$7,079 NZD
£3,142 GBP
A
Retailer 2
-
$8,588 NZD
$4,840 USD
View
A
Retailer 3
-
$11,198 NZD
$6,311 USD
View
A
Retailer 4
-
$13,362 NZD
$7,531 USD
View
B+
Retailer 5
-
$16,942 NZD
€9,094 EUR
View
B+
Retailer 6
-
$17,110 NZD
$9,643 USD
View
B+
Retailer 7
-
$17,894 NZD
£7,941 GBP
View
B+
Retailer 8
-
$24,077 NZD
$13,570 USD
View
Most Expensive
B
With Clarity
846663139 · Oct 31
$48,424 NZD
$27,292 USD
View
8 more retailers have this diamond
Prices start from $7,079 NZDSave up to $41,345 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
$7,079 NZD