Cushion|Lab Grown|IGI

4.21ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG780662156

Shape and cutting style on the report: Antique cushion cut

Certificate IGI LG780662156

Diamond specifications and retailer prices

From $5,734 CAD

$4,097 USD

As of October 29, 2026

Save $16,584 CAD (74%) vs most expensive(unlock to see where)

10 retailers carry this diamond

Most expensive: $22,318 CAD at MOH London · As of October 29, 2026

View at MOH London

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 LG780662156 or 780662156. Listed at 10 retailers as of October 29, 2026, with prices from $5,734 to $22,318, a $16,584 spread on the same certified stone. MOH London lists it at $22,318. 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

Color

Clarity

Ideal

Cut

Specifications

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle36.5°

Pavilion angle42.7°

OriginLab Grown

Grading LabIGI

CertificateIGI LG780662156

Dimensions10.81 × 8.68 × 5.88 mm

L/W Ratio1.25

Girdle conditionFaceted

Culet sizeLarge

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

View IGI Report →View Loupe360 Video →

Top View

OriginLab Grown

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateIGI LG780662156

Side View

Caratlytics Score

How it works →

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: $22,318 CAD|Low: $5,734 CAD|High: $49,199 CAD|Avg: $20,238 CAD|-4.0%

MOH London

Retailer 2

Retailer 3

Retailer 4

Retailer 5

Retailer 6

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Retailer 9

Retailer 10

Retailer 11

Retailer 12

Retailer 13

Retailer 14

Retailer 15

Retailer 16

October 30, 2026

Retailer 9$5,734 CAD

Retailer 16$8,690 CAD

Retailer 15$9,183 CAD

Retailer 8$9,587 CAD

Retailer 3$9,776 CAD

Retailer 12$11,878 CAD

Retailer 13$12,179 CAD

Retailer 11$12,512 CAD

Retailer 10$12,703 CAD

Retailer 14$13,422 CAD

Retailer 6$16,919 CAD

Retailer 2$18,259 CAD

MOH London$22,318 CAD

Retailer 4$31,911 CAD

Retailer 7$41,605 CAD

Retailer 5$49,199 CAD

30 data points across 16 retailers

10 retailers$5,734 CAD to $22,318 CAD

Cheapest Retailer

$5,734 CAD

$4,097 USD

Retailer 2

$8,690 CAD

$6,209 USD

View

Final sale: no returns

Retailer 3

$9,183 CAD

$6,561 USD

View

Retailer 4

$11,878 CAD

$8,487 USD

View

Retailer 5

$12,179 CAD

$8,702 USD

View

B+

Retailer 6

$12,512 CAD

$8,940 USD

View

B+

Retailer 7

$12,703 CAD

€8,644 EUR

View

B+

Retailer 8

$13,422 CAD

$9,590 USD

View

B+

Retailer 9

$18,259 CAD

$13,046 USD

View

Most Expensive

B+

MOH London

LG780662156 · Oct 29

$22,318 CAD

£12,556 GBP

View

9 more retailers have this diamond

Prices start from $5,734 CADSave up to $16,584 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.

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4.21ct Cushion

$5,734 CAD