Round|Lab Grown|IGI

8.18ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG605381441

Shape and cutting style on the report: Round brilliant

Certificate IGI LG605381441

Diamond specifications and retailer prices

From £1,266 GBP

$1,696 USD

As of October 30, 2026

Save £2,697 GBP (68%) vs most expensive(unlock to see where)

14 retailers carry this diamond

Most expensive: £3,963 GBP at Brilliant Earth · As of October 29, 2026

View at Brilliant Earth

About this 8.18ct lab-grown round diamond

This 8.18ct lab-grown round sits in the over five carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG605381441 or 605381441. Listed at 14 retailers as of October 29, 2026, with prices from £1,266 to £3,963, a £2,697 spread on the same certified stone. Brilliant Earth lists it at £3,963. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

8.18

Carat

Colour

SI1

Clarity

Ideal

Cut

Specifications

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle35.5°

Pavilion angle40.9°

OriginLab Grown

Grading LabIGI

CertificateIGI LG605381441

Dimensions12.90 × 12.85 × 7.98 mm

L/W Ratio1.00

Girdle conditionFaceted

Culet sizePointed

View IGI Report →View Loupe360 Video →

Top View

OriginLab Grown

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateIGI LG605381441

Side View

Caratlytics Score

How it works →

B+

Very Good

Strong quality and value balance

Unlock full score analysis

See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30

Current: £3,963 GBP|Low: £858 GBP|High: £4,090 GBP|Avg: £1,930 GBP|-3.1%

Brilliant Earth

Retailer 2

Retailer 3

Retailer 4

Retailer 5

Retailer 6

Retailer 7

Retailer 8

Retailer 9

Retailer 10

Retailer 11

October 31, 2026

Retailer 3£858 GBP

Retailer 8£872 GBP

Retailer 10£1,266 GBP

Retailer 4£1,319 GBP

Retailer 9£1,371 GBP

Retailer 6£1,373 GBP

Retailer 2£1,402 GBP

Retailer 7£1,849 GBP

Retailer 5£2,925 GBP

Retailer 11£3,420 GBP

Brilliant Earth£3,963 GBP

36 data points across 11 retailers

14 retailers£1,266 GBP to £3,963 GBP

Retailer 1

£740 GBP

$991 USD

Price last confirmed 39 days ago

Retailer 2

£805 GBP

$1,078 USD

View

Price last confirmed 38 days ago

Retailer 3

£846 GBP

$1,134 USD

View

Price last confirmed 35 days ago

Retailer 4

£872 GBP

View

Price last confirmed 15 days ago

B+

Retailer 5

£1,266 GBP

$1,696 USD

View

B+

Retailer 6

£1,319 GBP

View

B+

Retailer 7

£1,371 GBP

$1,837 USD

View

B+

Retailer 8

£1,373 GBP

$1,840 USD

View

B+

Retailer 9

£1,402 GBP

€1,789 EUR

View

Retailer 10

£1,608 GBP

$2,155 USD

View

Price last confirmed 35 days ago

B+

Retailer 11

£1,849 GBP

$2,478 USD

View

Retailer 12

£2,925 GBP

View

Retailer 13

£3,420 GBP

$4,582 USD

View

Most Expensive

Brilliant Earth

8497740A · Oct 29

£3,963 GBP

$5,310 USD

View

13 more retailers have this diamond

Prices start from £1,266 GBPSave up to £2,697 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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B+

8.18ct Round

£1,266 GBP