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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 $5,833 AUD
$4,088 USD
As of October 29, 2026
Save $12,739 AUD (69%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $18,572 AUD at Frank Darling · As of October 31, 2026
View at Frank Darling

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 $5,833 to $18,572, a $12,739 spread on the same certified stone. Frank Darling lists it at $18,572. 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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 29
Current: $18,572 AUD|Low: $5,833 AUD|High: $50,042 AUD|Avg: $20,290 AUD|-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$5,833 AUD
Retailer 13$6,113 AUD
Retailer 15$8,840 AUD
Retailer 12$8,974 AUD
Retailer 10$9,332 AUD
Retailer 3$9,943 AUD
Retailer 8$10,476 AUD
Retailer 11$12,086 AUD
Retailer 9$12,829 AUD
Retailer 2$15,463 AUD
Retailer 6$17,208 AUD
Frank Darling$18,572 AUD
Retailer 4$32,448 AUD
Retailer 7$42,356 AUD
Retailer 5$50,042 AUD

33 data points across 15 retailers

10 retailers$5,833 AUD to $18,572 AUD

A
Cheapest Retailer
-
$5,833 AUD
$4,088 USD
A
Retailer 2
-
$6,113 AUD
$4,284 USD
View
A
Retailer 3
-
$8,840 AUD
$6,195 USD
View
Final sale: no returns
A
Retailer 4
-
$8,974 AUD
$6,289 USD
View
A
Retailer 5
-
$9,332 AUD
$6,540 USD
View
A
Retailer 6
-
$10,476 AUD
$7,342 USD
View
A
Retailer 7
-
$12,086 AUD
$8,470 USD
View
B+
Retailer 8
-
$12,829 AUD
€8,563 EUR
View
B+
Retailer 9
-
$15,463 AUD
£8,533 GBP
View
Most Expensive
B+
Frank Darling
P82L-18EL · Oct 31
$18,572 AUD
$13,016 USD
View
9 more retailers have this diamond
Prices start from $5,833 AUDSave up to $12,739 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
$5,833 AUD