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Cushion|Lab Grown|IGI

4.28ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG780662034

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

Certificate IGI LG780662034

Diamond specifications and retailer prices

From $5,713 AUD
$4,013 USD
As of October 30, 2026
Save $29,863 AUD (84%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $35,576 AUD at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 4.28ct lab-grown cushion diamond

This 4.28ct 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 LG780662034 or 780662034. Listed at 11 retailers as of October 30, 2026, with prices from $5,713 to $35,576, a $29,863 spread on the same certified stone. Do Amore Diamonds lists it at $35,576. 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

4.28
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.4°
Pavilion angle38.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780662034
Dimensions9.70 × 9.39 × 6.28 mm
L/W Ratio1.03
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
9.70 mm9.39 mm4.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780662034
Side View
Table 57.0%Crown 35.4°Girdle: STK-THKPavilion 38.4°Culet: NoneDepth 66.9%

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: $35,576 AUD|Low: $5,713 AUD|High: $47,107 AUD|Avg: $16,203 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
October 30, 2026
Retailer 2$5,713 AUD
Retailer 7$5,993 AUD
Retailer 5$6,769 AUD
Retailer 11$8,134 AUD
Retailer 10$9,673 AUD
Retailer 6$11,413 AUD
Retailer 3$12,172 AUD
Retailer 8$14,258 AUD
Retailer 9$16,455 AUD
Retailer 4$18,877 AUD
Do Amore Diamonds$35,576 AUD

28 data points across 11 retailers

11 retailers$5,713 AUD to $35,576 AUD

A
Cheapest Retailer
-
$5,713 AUD
$4,013 USD
A
Retailer 2
-
$5,993 AUD
$4,210 USD
View
A
Retailer 3
-
$6,769 AUD
$4,755 USD
View
A
Retailer 4
-
$8,134 AUD
$5,714 USD
View
Final sale: no returns
A
Retailer 5
-
$9,673 AUD
$6,795 USD
View
A
Retailer 6
-
$11,413 AUD
€7,635 EUR
View
Retailer 7
-
$12,172 AUD
$8,550 USD
View
Price last confirmed 83 days ago
B+
Retailer 8
-
$14,258 AUD
£7,886 GBP
View
B+
Retailer 9
-
$16,455 AUD
$11,559 USD
View
B+
Retailer 10
-
$18,877 AUD
$13,260 USD
View
Most Expensive
B
Do Amore Diamonds
27-5A8A2550F · Oct 31
$35,576 AUD
$24,990 USD
View
10 more retailers have this diamond
Prices start from $5,713 AUDSave up to $29,863 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
4.28ct Cushion
$5,713 AUD