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 $6,148 CAD

$4,401 USD

As of October 30, 2026

Save $21,381 CAD (78%) vs most expensive(unlock to see where)

14 retailers carry this diamond

Most expensive: $27,529 CAD at Blue Nile · As of October 31, 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 30, 2026, with prices from $6,148 to $27,529, a $21,381 spread on the same certified stone. Blue Nile lists it at $27,529. 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

Color

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

View IGI Report →View Loupe360 Video →

Top View

OriginLab Grown

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateIGI LG780663283

Side View

Caratlytics Score

How it works →

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: $27,529 CAD|Low: $6,148 CAD|High: $31,402 CAD|Avg: $15,824 CAD|+48.2%

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$6,148 CAD

Retailer 2$6,567 CAD

Retailer 13$9,012 CAD

Retailer 10$9,243 CAD

Retailer 5$11,406 CAD

Retailer 14$11,715 CAD

Retailer 6$12,027 CAD

Retailer 8$12,192 CAD

Retailer 12$15,170 CAD

Retailer 3$15,825 CAD

Retailer 9$18,523 CAD

Retailer 4$20,519 CAD

Retailer 11$25,427 CAD

Blue Nile$27,529 CAD

36 data points across 14 retailers

14 retailers$6,148 CAD to $27,529 CAD

Cheapest Retailer

$6,148 CAD

$4,401 USD

Retailer 2

$6,567 CAD

$4,701 USD

View

Retailer 3

$9,012 CAD

HK$50,400 HKD

View

Retailer 4

$9,243 CAD

£5,210 GBP

View

Retailer 5

$11,406 CAD

$8,165 USD

View

Price last confirmed 12 days ago

Retailer 6

$11,715 CAD

€7,987 EUR

View

B+

Retailer 7

$12,027 CAD

$8,610 USD

View

Retailer 8

$12,192 CAD

$8,728 USD

View

B+

Retailer 9

$15,170 CAD

ZAR 175,446 ZAR

View

B+

Retailer 10

$15,825 CAD

£8,920 GBP

View

B+

Retailer 11

$18,523 CAD

$13,260 USD

View

B+

Retailer 12

$20,519 CAD

$14,689 USD

View

B+

Retailer 13

$25,427 CAD

$18,203 USD

View

Most Expensive

Blue Nile

29314697 · Oct 31

$27,529 CAD

$19,707 USD

View

13 more retailers have this diamond

Prices start from $6,148 CADSave up to $21,381 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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4.28ct Cushion

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