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 $7,809 NZD

$4,401 USD

As of November 1, 2026

Save $27,157 NZD (78%) vs most expensive(unlock to see where)

14 retailers carry this diamond

Most expensive: $34,966 NZD 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 31, 2026, with prices from $7,809 to $34,966, a $27,157 spread on the same certified stone. Blue Nile lists it at $34,966. 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

Colour

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: Nov 1

Current: $34,966 NZD|Low: $7,809 NZD|High: $39,886 NZD|Avg: $19,999 NZD|+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

November 1, 2026

Retailer 11$7,809 NZD

Retailer 10$8,341 NZD

Retailer 4$11,446 NZD

Retailer 8$11,740 NZD

Retailer 7$13,893 NZD

Retailer 6$14,487 NZD

Retailer 9$14,774 NZD

Retailer 12$15,486 NZD

Retailer 2$18,746 NZD

Retailer 3$19,269 NZD

Retailer 13$23,527 NZD

Retailer 5$26,063 NZD

Retailer 14$32,297 NZD

Blue Nile$34,966 NZD

36 data points across 14 retailers

14 retailers$7,809 NZD to $34,966 NZD

Cheapest Retailer

$7,809 NZD

$4,401 USD

Retailer 2

$8,341 NZD

$4,701 USD

View

Retailer 3

$11,446 NZD

HK$50,400 HKD

View

Retailer 4

$11,740 NZD

£5,210 GBP

View

Retailer 5

$13,893 NZD

$7,830 USD

View

Retailer 6

$14,487 NZD

$8,165 USD

View

Price last confirmed 13 days ago

Retailer 7

$14,774 NZD

€7,930 EUR

View

Retailer 8

$15,486 NZD

$8,728 USD

View

B+

Retailer 9

$18,746 NZD

£8,319 GBP

View

B+

Retailer 10

$19,269 NZD

ZAR 175,446 ZAR

View

B+

Retailer 11

$23,527 NZD

$13,260 USD

View

B+

Retailer 12

$26,063 NZD

$14,689 USD

View

Retailer 13

$32,297 NZD

$18,203 USD

View

Most Expensive

Blue Nile

29314697 · Oct 31

$34,966 NZD

$19,707 USD

View

13 more retailers have this diamond

Prices start from $7,809 NZDSave up to $27,157 NZD

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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