Cushion|Lab Grown|IGI

4.20ct D FL Cushion Lab Grown Diamond

EX • D/FL

Diamond specifications and retailer prices

From $7,554 AUD
$5,306 USD
As of October 31, 2026
Save $11,578 AUD (61%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: $36,715 AUD at Helzberg Diamonds · As of September 27, 2026
View at Helzberg Diamonds

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. Listed at 4 retailers as of October 31, 2026, with a 153% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
Dimensions9.40 × 9.21 × 6.25 mm
L/W Ratio1.02
Top View
9.40 mm9.21 mm4.20 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI
Side View
Table 61.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 67.9%

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 31
Current: $36,715 AUD|Low: $7,763 AUD|High: $36,715 AUD|Avg: $19,783 AUD
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
October 23, 2026
Retailer 3$7,763 AUD
Retailer 2$8,394 AUD
Retailer 4$19,132 AUD
Helzberg Diamonds$36,715 AUD

6 data points across 4 retailers

4 retailers$7,554 AUD to $19,132 AUD

A
Cheapest Retailer
-
$7,554 AUD
$5,306 USD
A
Retailer 2
-
$7,763 AUD
$5,453 USD
View
B+
Retailer 3
-
$19,132 AUD
$13,439 USD
View
Most Expensive
Helzberg Diamonds
ZXZOGJMIJLMH · Sep 27
$36,715 AUD
$25,790 USD
View
Price last confirmed 35 days ago
3 more retailers have this diamond
Prices start from $7,554 AUDSave up to $11,578 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
$7,554 AUD