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Cushion|Lab Grown|IGI

4.21ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG628448091

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG628448091

Diamond specifications and retailer prices

From $5,626 AUD
$3,952 USD
As of October 30, 2026
Save $29,394 AUD (84%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $35,021 AUD at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

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 LG628448091 or 628448091. Listed at 12 retailers as of October 30, 2026, with prices from $5,626 to $35,021, a $29,394 spread on the same certified stone. Do Amore Diamonds lists it at $35,021. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.5°
Pavilion angle37.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG628448091
Dimensions9.23 × 9.07 × 6.15 mm
L/W Ratio1.02
Girdle conditionFaceted
Culet sizePointed
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
9.23 mm9.07 mm4.21 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG628448091
Side View
Table 58.0%Crown 37.5°Girdle: THK-VTKPavilion 37.6°Culet: NoneDepth 67.8%

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: Oct 30
Current: $35,021 AUD|Low: $5,626 AUD|High: $46,367 AUD|Avg: $16,726 AUD|-24.5%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 31, 2026
Retailer 5$5,626 AUD
Retailer 8$5,894 AUD
Retailer 7$6,571 AUD
Retailer 3$8,009 AUD
Retailer 11$9,525 AUD
Retailer 2$11,147 AUD
Retailer 12$11,617 AUD
Retailer 9$14,037 AUD
Retailer 10$16,194 AUD
Retailer 6$18,578 AUD
Retailer 4$28,505 AUD
Do Amore Diamonds$35,021 AUD

30 data points across 12 retailers

12 retailers$5,626 AUD to $35,021 AUD

A
Cheapest Retailer
-
$5,626 AUD
$3,952 USD
A
Retailer 2
-
$5,894 AUD
$4,140 USD
View
A
Retailer 3
-
$6,571 AUD
$4,616 USD
View
A
Retailer 4
-
$8,009 AUD
$5,626 USD
View
Final sale: no returns
A
Retailer 5
-
$9,525 AUD
$6,691 USD
View
A
Retailer 6
-
$11,147 AUD
€7,457 EUR
View
Retailer 7
-
$11,617 AUD
$8,160 USD
View
Price last confirmed 13 days ago
B+
Retailer 8
-
$14,037 AUD
£7,764 GBP
View
B+
Retailer 9
-
$16,194 AUD
$11,375 USD
View
B+
Retailer 10
-
$18,578 AUD
$13,050 USD
View
B
Retailer 11
-
$28,505 AUD
$20,023 USD
View
Most Expensive
B
Do Amore Diamonds
27-AD300EFA9 · Oct 31
$35,021 AUD
$24,600 USD
View
11 more retailers have this diamond
Prices start from $5,626 AUDSave up to $29,394 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
$5,626 AUD