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Cushion|Lab Grown|IGI

4.28ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG762545820

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG762545820

Diamond specifications and retailer prices

From $6,265 AUD
$4,401 USD
As of October 30, 2026
Save $21,790 AUD (78%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $28,055 AUD at Blue Nile · As of October 31, 2026
View at Blue Nile

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 LG762545820 or 762545820. Listed at 14 retailers as of October 30, 2026, with prices from $6,265 to $28,055, a $21,790 spread on the same certified stone. Blue Nile lists it at $28,055. 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 angle33.2°
Pavilion angle35.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG762545820
Dimensions10.79 × 8.75 × 5.75 mm
L/W Ratio1.23
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
10.79 mm8.75 mm4.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG762545820
Side View
Table 58.0%Crown 33.2°Girdle: MED-THKPavilion 35.3°Culet: NoneDepth 65.7%

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 30
Current: $28,055 AUD|Low: $6,265 AUD|High: $32,003 AUD|Avg: $15,923 AUD|+48.2%
Blue Nile
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
October 31, 2026
Retailer 7$6,265 AUD
Retailer 2$6,692 AUD
Retailer 13$9,184 AUD
Retailer 10$9,419 AUD
Retailer 5$11,624 AUD
Retailer 14$11,939 AUD
Retailer 6$12,257 AUD
Retailer 8$12,425 AUD
Retailer 12$15,460 AUD
Retailer 3$16,127 AUD
Retailer 9$18,877 AUD
Retailer 4$20,911 AUD
Retailer 11$25,913 AUD
Blue Nile$28,055 AUD

37 data points across 14 retailers

14 retailers$6,265 AUD to $28,055 AUD

A
Cheapest Retailer
-
$6,265 AUD
$4,401 USD
A
Retailer 2
-
$6,692 AUD
$4,701 USD
View
A
Retailer 3
-
$9,184 AUD
HK$50,400 HKD
View
A
Retailer 4
-
$9,419 AUD
£5,210 GBP
View
Retailer 5
-
$11,624 AUD
$8,165 USD
View
Price last confirmed 12 days ago
A
Retailer 6
-
$11,939 AUD
€7,987 EUR
View
A
Retailer 7
-
$12,257 AUD
$8,610 USD
View
A
Retailer 8
-
$12,425 AUD
$8,728 USD
View
B+
Retailer 9
-
$15,460 AUD
ZAR 175,446 ZAR
View
B+
Retailer 10
-
$16,127 AUD
£8,920 GBP
View
B+
Retailer 11
-
$18,877 AUD
$13,260 USD
View
B+
Retailer 12
-
$20,911 AUD
$14,689 USD
View
B
Retailer 13
-
$25,913 AUD
$18,203 USD
View
Most Expensive
B
Blue Nile
29977365 · Oct 31
$28,055 AUD
$19,707 USD
View
13 more retailers have this diamond
Prices start from $6,265 AUDSave up to $21,790 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
$6,265 AUD