Round|Lab Grown|IGI

18.51ct G VS1 Round Lab Grown Diamond

ID • G/VS1 • IGI LG786667076

Shape and cutting style on the report: Round brilliant

Certificate IGI LG786667076

Diamond specifications and retailer prices

From £5,638 GBP

As of October 30, 2026

Save £21,267 GBP (79%) vs most expensive(unlock to see where)

18 retailers carry this diamond

Most expensive: £26,905 GBP at Brilliant Earth · As of October 31, 2026

View at Brilliant Earth

About this 18.51ct lab-grown round diamond

This 18.51ct lab-grown round sits in the over five carat band, graded G colour (near-colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG786667076 or 786667076. Listed at 18 retailers as of October 30, 2026, with prices from £5,638 to £26,905, a £21,267 spread on the same certified stone. Brilliant Earth lists it at £26,905. 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

18.51

Carat

Colour

VS1

Clarity

Ideal

Cut

Specifications

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle33.8°

Pavilion angle40.9°

OriginLab Grown

Grading LabIGI

CertificateIGI LG786667076

Dimensions17.01 × 17.07 × 10.36 mm

L/W Ratio1.00

Girdle conditionFaceted

Culet sizePointed

Cert comments

This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa

View IGI Report →View Loupe360 Video →

Top View

OriginLab Grown

CutIdeal

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateIGI LG786667076

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 30

Current: £26,905 GBP|Low: £5,619 GBP|High: £27,674 GBP|Avg: £10,599 GBP|-2.8%

Brilliant Earth

Retailer 2

Retailer 3

Retailer 4

Retailer 5

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Retailer 9

Retailer 10

Retailer 11

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Retailer 18

October 31, 2026

Retailer 11£5,638 GBP

Retailer 18£6,033 GBP

Retailer 9£6,275 GBP

Retailer 7£6,607 GBP

Retailer 5£6,999 GBP

Retailer 10£6,999 GBP

Retailer 14£7,001 GBP

Retailer 16£7,336 GBP

Retailer 17£7,786 GBP

Retailer 6£7,872 GBP

Retailer 4£8,101 GBP

Retailer 12£8,597 GBP

Retailer 13£10,835 GBP

Retailer 2£11,631 GBP

Retailer 15£13,328 GBP

Retailer 3£16,712 GBP

Retailer 8£22,668 GBP

Brilliant Earth£26,905 GBP

34 data points across 18 retailers

18 retailers£5,638 GBP to £26,905 GBP

Cheapest Retailer

£5,638 GBP

Retailer 2

£6,033 GBP

$8,084 USD

View

Retailer 3

£6,275 GBP

$8,408 USD

View

Retailer 4

£6,607 GBP

$8,853 USD

View

Retailer 5

£6,999 GBP

$9,378 USD

View

Price last confirmed 19 days ago

B+

Retailer 6

£6,999 GBP

$9,378 USD

View

B+

Retailer 7

£7,001 GBP

$9,380 USD

View

Retailer 8

£7,336 GBP

$9,830 USD

View

Price last confirmed 13 days ago

B+

Retailer 9

£7,786 GBP

$10,432 USD

View

B+

Retailer 10

£7,872 GBP

$10,547 USD

View

B+

Retailer 11

£8,101 GBP

$10,855 USD

View

B+

Retailer 12

£8,597 GBP

View

B+

Retailer 13

£10,835 GBP

ZAR 234,524 ZAR

View

Retailer 14

£11,631 GBP

€14,842 EUR

View

Retailer 15

£13,328 GBP

A$27,473 AUD

View

Price last confirmed 9 days ago

Retailer 16

£16,712 GBP

$22,392 USD

View

Retailer 17

£22,668 GBP

$30,372 USD

View

Most Expensive

Brilliant Earth

18294822A · Oct 31

£26,905 GBP

$36,050 USD

View

17 more retailers have this diamond

Prices start from £5,638 GBPSave up to £21,267 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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18.51ct Round

£5,638 GBP