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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 $4,668 USD
As of October 29, 2026
Save $16,476 USD (78%) 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 LG762545820 or 762545820. Listed at 14 retailers as of October 29, 2026, with prices from $4,668 to $21,144, a $16,476 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 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 29
Current: $21,144 USD|Low: $4,668 USD|High: $22,480 USD|Avg: $11,272 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 30, 2026
Retailer 13$4,668 USD
Retailer 14$4,754 USD
Retailer 10$6,451 USD
Retailer 7$6,617 USD
Retailer 5$8,165 USD
Retailer 11$8,386 USD
Retailer 6$8,610 USD
Retailer 3$9,249 USD
Retailer 9$10,860 USD
Retailer 12$11,328 USD
Retailer 2$13,260 USD
Retailer 4$14,689 USD
Retailer 8$18,203 USD
Blue Nile$21,144 USD

39 data points across 14 retailers

14 retailers$4,668 USD to $21,144 USD

A
Cheapest Retailer
-
$4,668 USD
A
Retailer 2
-
$4,754 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 11 days ago
A
Retailer 6
-
$8,386 USD
€7,987 EUR
View
B+
Retailer 7
-
$8,610 USD
View
B+
Retailer 8
-
$9,249 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
29977365 · Oct 29
$21,144 USD
View
13 more retailers have this diamond
Prices start from $4,668 USDSave up to $16,476 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
$4,668 USD