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Cushion|Lab Grown|IGI

4.28ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG780663283

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG780663283

Diamond specifications and retailer prices

From $4,401 USD
As of October 30, 2026
Save $16,743 USD (79%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $21,144 USD at Blue Nile · As of October 29, 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 LG780663283 or 780663283. Listed at 14 retailers as of October 29, 2026, with prices from $4,401 to $21,144, a $16,743 spread on the same certified stone. Blue Nile lists it at $21,144. 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
Color
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle35.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780663283
Dimensions11.04 × 8.60 × 5.74 mm
L/W Ratio1.28
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
11.04 mm8.60 mm4.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780663283
Side View
Table 60.0%Crown 34°Girdle: MED-THKPavilion 35.2°Culet: NoneDepth 66.7%

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 30
Current: $21,144 USD|Low: $4,401 USD|High: $22,480 USD|Avg: $11,200 USD|+59.0%
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$4,401 USD
Retailer 2$4,701 USD
Retailer 13$6,451 USD
Retailer 10$6,617 USD
Retailer 5$8,165 USD
Retailer 14$8,386 USD
Retailer 6$8,610 USD
Retailer 8$8,728 USD
Retailer 12$10,860 USD
Retailer 3$11,328 USD
Retailer 9$13,260 USD
Retailer 4$14,689 USD
Retailer 11$18,203 USD
Blue Nile$21,144 USD

37 data points across 14 retailers

14 retailers$4,401 USD to $21,144 USD

A
Cheapest Retailer
-
$4,401 USD
A
Retailer 2
-
$4,701 USD
View
A
Retailer 3
-
$6,451 USD
HK$50,400 HKD
View
A
Retailer 4
-
$6,617 USD
£5,210 GBP
View
Retailer 5
-
$8,165 USD
View
Price last confirmed 12 days ago
A
Retailer 6
-
$8,386 USD
€7,987 EUR
View
B+
Retailer 7
-
$8,610 USD
View
A
Retailer 8
-
$8,728 USD
View
B+
Retailer 9
-
$10,860 USD
ZAR 175,446 ZAR
View
B+
Retailer 10
-
$11,328 USD
£8,920 GBP
View
B+
Retailer 11
-
$13,260 USD
View
B+
Retailer 12
-
$14,689 USD
View
B+
Retailer 13
-
$18,203 USD
View
Most Expensive
B
Blue Nile
29314697 · Oct 29
$21,144 USD
View
13 more retailers have this diamond
Prices start from $4,401 USDSave up to $16,743 USD

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
$4,401 USD