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Cushion|Lab Grown|IGI

4.21ct D FL Cushion Lab Grown Diamond

EX • D/FL • IGI LG804605050

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG804605050

Diamond specifications and retailer prices

From $8,117 AUD
$5,702 USD
As of October 26, 2026
Save $41,109 AUD (84%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: $49,227 AUD at With Clarity · As of October 31, 2026
View at With Clarity

About this 4.21ct lab-grown cushion diamond

This 4.21ct 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 LG804605050 or 804605050. Listed at 21 retailers as of October 26, 2026, with prices from $8,117 to $49,227, a $41,109 spread on the same certified stone. With Clarity lists it at $49,227. 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

4.21
Carat
D
Colour
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle37.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG804605050
Dimensions10.97 × 8.56 × 5.72 mm
L/W Ratio1.28
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
10.97 mm8.56 mm4.21 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG804605050
Side View
Table 61.0%Crown 35.5°Girdle: MED-STKPavilion 37.5°Culet: NoneDepth 66.8%

Caratlytics Score

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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 26
Current: $12,467 AUD|Low: $7,837 AUD|High: $48,293 AUD|Avg: $19,031 AUD|+0.3%
Retailer 1
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
Retailer 16
Retailer 17
Retailer 18
With Clarity
November 1, 2026
Retailer 15$8,117 AUD
Retailer 5$9,022 AUD
Retailer 3$9,538 AUD
Retailer 4$9,688 AUD
Retailer 2$9,693 AUD
Retailer 6$9,794 AUD
Retailer 12$11,106 AUD
Retailer 1$12,467 AUD
Retailer 11$15,205 AUD
Retailer 17$16,403 AUD
Retailer 14$19,830 AUD
Retailer 13$20,631 AUD
Retailer 16$21,676 AUD
Retailer 7$24,999 AUD
Retailer 8$26,132 AUD
Retailer 9$26,966 AUD
Retailer 18$31,476 AUD
Retailer 10$33,944 AUD
With Clarity$48,293 AUD

40 data points across 19 retailers

21 retailers$8,117 AUD to $49,227 AUD

A
Cheapest Retailer
-
$8,117 AUD
$5,702 USD
A
Retailer 2
-
$9,022 AUD
CA$8,802 CAD
View
A
Retailer 3
-
$9,538 AUD
$6,700 USD
View
A
Retailer 4
-
$9,688 AUD
$6,805 USD
View
Retailer 5
-
$9,693 AUD
$6,809 USD
View
Price last confirmed 16 days ago
A
Retailer 6
-
$9,794 AUD
$6,880 USD
View
A
Retailer 7
-
$11,106 AUD
$7,801 USD
View
Final sale: no returns
A
Retailer 8
-
$12,467 AUD
£6,895 GBP
View
B+
Retailer 9
-
$13,798 AUD
£7,632 GBP
View
B+
Retailer 10
-
$15,205 AUD
€10,172 EUR
View
B+
Retailer 11
-
$16,403 AUD
$11,522 USD
View
B+
Retailer 12
-
$19,830 AUD
£10,968 GBP
View
B+
Retailer 13
-
$20,631 AUD
ZAR 234,123 ZAR
View
B
Retailer 14
-
$21,676 AUD
$15,226 USD
View
B
Retailer 15
-
$24,999 AUD
$17,561 USD
View
B
Retailer 16
-
$26,132 AUD
$18,356 USD
View
B
Retailer 17
-
$26,966 AUD
$18,942 USD
View
B
Retailer 18
-
$28,505 AUD
$20,023 USD
View
B
Retailer 19
-
$31,476 AUD
$22,110 USD
View
B
Retailer 20
-
$33,944 AUD
$23,844 USD
View
Most Expensive
B
With Clarity
804605050 · Oct 31
$49,227 AUD
$34,579 USD
View
20 more retailers have this diamond
Prices start from $8,117 AUDSave up to $41,109 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
4.21ct Cushion
$8,117 AUD