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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 $5,680 AUD
£3,142 GBP
As of November 1, 2026
Save $33,173 AUD (85%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: $38,853 AUD 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 $5,680 to $38,853, a $33,173 spread on the same certified stone. With Clarity lists it at $38,853. 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: $14,120 AUD|Low: $5,680 AUD|High: $41,961 AUD|Avg: $14,908 AUD|-1.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
With Clarity
November 1, 2026
Retailer 3$5,680 AUD
Retailer 4$6,890 AUD
Retailer 6$8,984 AUD
Retailer 2$10,559 AUD
Retailer 7$13,594 AUD
Retailer 8$13,728 AUD
Retailer 1$14,120 AUD
Retailer 5$19,318 AUD
With Clarity$38,853 AUD

8 data points across 9 retailers

9 retailers$5,680 AUD to $38,853 AUD

A
Cheapest Retailer
-
$5,680 AUD
£3,142 GBP
A
Retailer 2
-
$6,890 AUD
$4,840 USD
View
A
Retailer 3
-
$8,984 AUD
$6,311 USD
View
A
Retailer 4
-
$10,559 AUD
$7,417 USD
View
B+
Retailer 5
-
$13,594 AUD
€9,094 EUR
View
B+
Retailer 6
-
$13,728 AUD
$9,643 USD
View
B+
Retailer 7
-
$14,120 AUD
£7,810 GBP
View
B+
Retailer 8
-
$19,318 AUD
$13,570 USD
View
Most Expensive
B
With Clarity
846663139 · Oct 31
$38,853 AUD
$27,292 USD
View
8 more retailers have this diamond
Prices start from $5,680 AUDSave up to $33,173 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
4.20ct Cushion
$5,680 AUD