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 $3,009 NZD

$1,696 USD

As of November 1, 2026

Save $6,412 NZD (68%) vs most expensive(unlock to see where)

14 retailers carry this diamond

Most expensive: $9,422 NZD at Brilliant Earth · As of October 31, 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 31, 2026, with prices from $3,009 to $9,422, a $6,412 spread on the same certified stone. Brilliant Earth lists it at $9,422. 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: Nov 1

Current: $9,422 NZD|Low: $2,040 NZD|High: $9,723 NZD|Avg: $4,586 NZD|-3.1%

Brilliant Earth

Retailer 2

Retailer 3

Retailer 4

Retailer 5

Retailer 6

Retailer 7

Retailer 8

Retailer 9

Retailer 10

Retailer 11

November 2, 2026

Retailer 3$2,040 NZD

Retailer 8$2,074 NZD

Retailer 10$3,009 NZD

Retailer 4$3,136 NZD

Retailer 9$3,259 NZD

Retailer 6$3,265 NZD

Retailer 2$3,346 NZD

Retailer 7$4,397 NZD

Retailer 5$6,918 NZD

Retailer 11$8,130 NZD

Brilliant Earth$9,422 NZD

37 data points across 11 retailers

14 retailers$3,009 NZD to $9,422 NZD

Retailer 1

$1,758 NZD

$991 USD

Price last confirmed 39 days ago

Retailer 2

$1,913 NZD

$1,078 USD

View

Price last confirmed 39 days ago

Retailer 3

$2,012 NZD

$1,134 USD

View

Price last confirmed 35 days ago

Retailer 4

$2,074 NZD

£920 GBP

View

Price last confirmed 16 days ago

B+

Retailer 5

$3,009 NZD

$1,696 USD

View

B+

Retailer 6

$3,136 NZD

£1,392 GBP

View

B+

Retailer 7

$3,259 NZD

$1,837 USD

View

B+

Retailer 8

$3,265 NZD

$1,840 USD

View

B+

Retailer 9

$3,346 NZD

€1,796 EUR

View

Retailer 10

$3,824 NZD

$2,155 USD

View

Price last confirmed 36 days ago

B+

Retailer 11

$4,397 NZD

$2,478 USD

View

Retailer 12

$6,918 NZD

£3,070 GBP

View

Retailer 13

$8,130 NZD

$4,582 USD

View

Most Expensive

Brilliant Earth

8497740A · Oct 31

$9,422 NZD

$5,310 USD

View

13 more retailers have this diamond

Prices start from $3,009 NZDSave up to $6,412 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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8.18ct Round

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