CaratHunter
Plans
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 $5,727 CAD
$4,100 USD
As of October 29, 2026
Save $28,636 CAD (83%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $34,364 CAD 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 29, 2026, with prices from $5,727 to $34,364, a $28,636 spread on the same certified stone. Do Amore Diamonds lists it at $34,364. 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 29
Current: $34,364 CAD|Low: $5,727 CAD|High: $45,497 CAD|Avg: $16,499 CAD|-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 11$5,727 CAD
Retailer 7$5,783 CAD
Retailer 5$6,448 CAD
Retailer 3$7,859 CAD
Retailer 10$9,347 CAD
Retailer 6$11,015 CAD
Retailer 12$11,399 CAD
Retailer 8$13,774 CAD
Retailer 9$15,890 CAD
Retailer 2$18,230 CAD
Retailer 4$27,970 CAD
Do Amore Diamonds$34,364 CAD

29 data points across 12 retailers

12 retailers$5,727 CAD to $34,364 CAD

A
Cheapest Retailer
-
$5,727 CAD
$4,100 USD
A
Retailer 2
-
$5,783 CAD
$4,140 USD
View
A
Retailer 3
-
$6,448 CAD
$4,616 USD
View
A
Retailer 4
-
$7,859 CAD
$5,626 USD
View
Final sale: no returns
A
Retailer 5
-
$9,347 CAD
$6,691 USD
View
A
Retailer 6
-
$11,015 CAD
€7,510 EUR
View
Retailer 7
-
$11,399 CAD
$8,160 USD
View
Price last confirmed 11 days ago
B+
Retailer 8
-
$13,774 CAD
£7,764 GBP
View
B+
Retailer 9
-
$15,890 CAD
$11,375 USD
View
B+
Retailer 10
-
$18,230 CAD
$13,050 USD
View
B
Retailer 11
-
$27,970 CAD
$20,023 USD
View
Most Expensive
B
Do Amore Diamonds
27-AD300EFA9 · Oct 30
$34,364 CAD
$24,600 USD
View
11 more retailers have this diamond
Prices start from $5,727 CADSave up to $28,636 CAD

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
$5,727 CAD