Round|Lab Grown|IGI

4.18ct D IF Round Lab Grown Diamond

ID • D/IF • IGI LG683520148

Shape and cutting style on the report: Round brilliant

Certificate IGI LG683520148

Diamond specifications and retailer prices

From £1,388 GBP

As of October 29, 2026

Save £10,484 GBP (88%) vs most expensive(unlock to see where)

28 retailers carry this diamond

Most expensive: £11,872 GBP at Brilliant Earth · As of October 24, 2026

View at Brilliant Earth

About this 4.18ct lab-grown round diamond

This 4.18ct 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 LG683520148 or 683520148. Listed at 28 retailers as of October 24, 2026, with prices from £1,388 to £11,872, a £10,484 spread on the same certified stone. Brilliant Earth lists it at £11,872. 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

4.18

Carat

Colour

Clarity

Ideal

Cut

Specifications

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle33.6°

Pavilion angle40.4°

OriginLab Grown

Grading LabIGI

CertificateIGI LG683520148

Dimensions10.53 × 10.48 × 6.25 mm

L/W Ratio1.00

Girdle conditionFaceted

Culet sizePointed

Cert comments

HEARTS & ARROWS 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 LG683520148

Side View

Caratlytics Score

How it works →

A+

Exceptional

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: £11,872 GBP|Low: £1,380 GBP|High: £11,872 GBP|Avg: £3,531 GBP

Brilliant Earth

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

Retailer 15

Retailer 16

Retailer 17

Retailer 18

Retailer 19

Retailer 20

Retailer 21

Retailer 22

October 29, 2026

Retailer 17£1,388 GBP

Retailer 14£1,539 GBP

Retailer 6£1,561 GBP

Retailer 8£1,617 GBP

Retailer 15£1,674 GBP

Retailer 21£1,786 GBP

Retailer 19£1,787 GBP

Retailer 5£2,115 GBP

Retailer 13£2,446 GBP

Retailer 20£2,534 GBP

Retailer 4£2,687 GBP

Retailer 3£2,720 GBP

Retailer 16£3,495 GBP

Retailer 2£3,799 GBP

Retailer 12£3,830 GBP

Retailer 10£4,357 GBP

Retailer 18£4,543 GBP

Retailer 9£4,585 GBP

Retailer 7£5,104 GBP

Retailer 11£6,119 GBP

Retailer 22£9,589 GBP

Brilliant Earth£11,872 GBP

28 data points across 22 retailers

28 retailers£1,388 GBP to £11,872 GBP

A+

Cheapest Retailer

£1,388 GBP

Retailer 2

£1,539 GBP

$2,049 USD

View

Price last confirmed 7 days ago

Retailer 3

£1,561 GBP

$2,079 USD

View

Final sale: no returns

Retailer 4

£1,617 GBP

$2,153 USD

View

Retailer 5

£1,674 GBP

$2,229 USD

View

Price last confirmed 9 days ago

Retailer 6

£1,785 GBP

$2,377 USD

View

Price last confirmed 18 days ago

Retailer 7

£1,786 GBP

$2,378 USD

View

Retailer 8

£1,787 GBP

$2,380 USD

View

Retailer 9

£2,115 GBP

HK$22,000 HKD

View

Retailer 10

£2,446 GBP

View

Retailer 11

£2,453 GBP

$3,267 USD

View

Price last confirmed 8 days ago

Retailer 12

£2,534 GBP

$3,375 USD

View

Retailer 13

£2,687 GBP

$3,578 USD

View

Retailer 14

£2,720 GBP

$3,622 USD

View

Retailer 15

£3,495 GBP

€4,432 EUR

View

Retailer 16

£3,799 GBP

ZAR 81,735 ZAR

View

Retailer 17

£3,830 GBP

A$7,847 AUD

View

Price last confirmed 7 days ago

Retailer 18

£4,357 GBP

$5,802 USD

View

B+

Retailer 19

£4,543 GBP

$6,050 USD

View

Retailer 20

£4,585 GBP

$6,105 USD

View

B+

Retailer 21

£5,021 GBP

$6,687 USD

View

B+

Retailer 22

£5,104 GBP

View

B+

Retailer 23

£6,119 GBP

SGD 11,011 SGD

View

B+

Retailer 24

£6,244 GBP

$8,315 USD

View

Retailer 25

£7,076 GBP

View

Price last confirmed 20 days ago

Retailer 26

£9,589 GBP

$12,770 USD

View

Retailer 27

£11,805 GBP

$15,720 USD

View

Most Expensive

Brilliant Earth

13152316A · Oct 24

£11,872 GBP

$15,810 USD

View

27 more retailers have this diamond

Prices start from £1,388 GBPSave up to £10,484 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.

Similar diamonds

A+

4.18ct Round

£1,388 GBP