Round|Lab Grown|IGI

4.26ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG711516896

Shape and cutting style on the report: Round brilliant

Certificate IGI LG711516896

Diamond specifications and retailer prices

From £1,428 GBP

$1,913 USD

As of October 29, 2026

Save £14,156 GBP (91%) vs most expensive(unlock to see where)

27 retailers carry this diamond

Most expensive: £15,583 GBP at Brilliant Earth · As of October 30, 2026

View at Brilliant Earth

About this 4.26ct lab-grown round diamond

This 4.26ct lab-grown round sits in the three to five carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG711516896 or 711516896. Listed at 27 retailers as of October 29, 2026, with prices from £1,428 to £15,583, a £14,156 spread on the same certified stone. Brilliant Earth lists it at £15,583. 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

4.26

Carat

Colour

Clarity

Ideal

Cut

Specifications

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle34.4°

Pavilion angle40.7°

OriginLab Grown

Grading LabIGI

CertificateIGI LG711516896

Dimensions10.43 × 10.39 × 6.43 mm

L/W Ratio1.00

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 LG711516896

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 29

Current: £15,583 GBP|Low: £1,553 GBP|High: £17,845 GBP|Avg: £4,626 GBP|-12.7%

Brilliant Earth

Retailer 2

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October 31, 2026

Retailer 18£1,553 GBP

Retailer 8£1,599 GBP

Retailer 15£1,780 GBP

Retailer 7£1,854 GBP

Retailer 4£2,326 GBP

Retailer 2£2,505 GBP

Retailer 19£2,719 GBP

Retailer 14£2,765 GBP

Retailer 3£2,771 GBP

Retailer 12£3,891 GBP

Retailer 16£3,922 GBP

Retailer 17£4,575 GBP

Retailer 5£4,682 GBP

Retailer 10£4,795 GBP

Retailer 13£4,986 GBP

Retailer 11£6,391 GBP

Retailer 9£8,517 GBP

Retailer 6£9,822 GBP

Brilliant Earth£15,583 GBP

40 data points across 19 retailers

27 retailers£1,428 GBP to £15,583 GBP

Cheapest Retailer

£1,428 GBP

$1,913 USD

Retailer 2

£1,553 GBP

$2,081 USD

View

Retailer 3

£1,599 GBP

$2,142 USD

View

Final sale: no returns

Retailer 4

£1,656 GBP

$2,219 USD

View

Retailer 5

£1,780 GBP

$2,385 USD

View

Retailer 6

£1,832 GBP

$2,455 USD

View

Price last confirmed 20 days ago

Retailer 7

£1,854 GBP

$2,484 USD

View

Retailer 8

£2,326 GBP

$3,117 USD

View

Retailer 9

£2,505 GBP

View

Retailer 10

£2,512 GBP

$3,366 USD

View

Retailer 11

£2,719 GBP

$3,643 USD

View

Retailer 12

£2,765 GBP

€3,528 EUR

View

Retailer 13

£2,771 GBP

$3,713 USD

View

Retailer 14

£3,891 GBP

ZAR 84,214 ZAR

View

Retailer 15

£3,922 GBP

A$8,085 AUD

View

Price last confirmed 8 days ago

Retailer 16

£4,201 GBP

$5,629 USD

View

Retailer 17

£4,575 GBP

$6,130 USD

View

Price last confirmed 10 days ago

B+

Retailer 18

£4,682 GBP

$6,274 USD

View

B+

Retailer 19

£4,795 GBP

$6,424 USD

View

B+

Retailer 20

£4,986 GBP

View

B+

Retailer 21

£6,391 GBP

$8,564 USD

View

B+

Retailer 22

£7,433 GBP

$9,960 USD

View

Retailer 23

£8,517 GBP

$11,412 USD

View

Retailer 24

£9,822 GBP

$13,160 USD

View

Retailer 25

£13,971 GBP

$18,720 USD

View

Retailer 26

£13,971 GBP

$18,720 USD

View

Most Expensive

Brilliant Earth

16521058A · Oct 30

£15,583 GBP

$20,880 USD

View

26 more retailers have this diamond

Prices start from £1,428 GBPSave up to £14,156 GBP

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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