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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 $3,952 USD
As of October 30, 2026
Save $20,648 USD (84%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $24,600 USD at Do Amore Diamonds · As of October 30, 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 $3,952 to $24,600, a $20,648 spread on the same certified stone. Do Amore Diamonds lists it at $24,600. 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
Color
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: $24,600 USD|Low: $3,952 USD|High: $32,570 USD|Avg: $11,811 USD|-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 30, 2026
Retailer 2$3,952 USD
Retailer 8$4,140 USD
Retailer 6$4,616 USD
Retailer 3$5,626 USD
Retailer 11$6,691 USD
Retailer 7$7,886 USD
Retailer 12$8,160 USD
Retailer 9$9,860 USD
Retailer 10$11,375 USD
Retailer 5$13,050 USD
Retailer 4$20,023 USD
Do Amore Diamonds$24,600 USD

29 data points across 12 retailers

12 retailers$3,952 USD to $24,600 USD

A
Cheapest Retailer
-
$3,952 USD
A
Retailer 2
-
$4,140 USD
View
A
Retailer 3
-
$4,616 USD
View
A
Retailer 4
-
$5,626 USD
View
Final sale: no returns
A
Retailer 5
-
$6,691 USD
View
A
Retailer 6
-
$7,886 USD
€7,510 EUR
View
Retailer 7
-
$8,160 USD
View
Price last confirmed 12 days ago
B+
Retailer 8
-
$9,860 USD
£7,764 GBP
View
B+
Retailer 9
-
$11,375 USD
View
B+
Retailer 10
-
$13,050 USD
View
B
Retailer 11
-
$20,023 USD
View
Most Expensive
B
Do Amore Diamonds
27-AD300EFA9 · Oct 30
$24,600 USD
View
11 more retailers have this diamond
Prices start from $3,952 USDSave up to $20,648 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
4.21ct Cushion
$3,952 USD