Round|Lab Grown|IGI

16.51ct G VS1 Round Lab Grown Diamond

EX • G/VS1 • IGI LG837681313

Shape and cutting style on the report: Round brilliant

Certificate IGI LG837681313

Diamond specifications and retailer prices

From £4,090 GBP

As of November 1, 2026

Save £19,636 GBP (83%) vs most expensive(unlock to see where)

19 retailers carry this diamond

Most expensive: £23,726 GBP at Brilliant Earth · As of October 31, 2026

View at Brilliant Earth

About this 16.51ct lab-grown round diamond

This 16.51ct 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 LG837681313 or 837681313. Listed at 19 retailers as of October 31, 2026, with prices from £4,090 to £23,726, a £19,636 spread on the same certified stone. Brilliant Earth lists it at £23,726. 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

16.51

Carat

Colour

VS1

Clarity

Excellent

Cut

Specifications

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

Crown angle36.5°

Pavilion angle41.3°

OriginLab Grown

Grading LabIGI

CertificateIGI LG837681313

Dimensions16.08 × 16.16 × 10.14 mm

L/W Ratio1.00

Girdle conditionFaceted

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

CutExcellent

PolishExcellent

SymmetryExcellent

FluorescenceNone

CertificateIGI LG837681313

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: Nov 1

Current: £23,726 GBP|Low: £4,090 GBP|High: £23,905 GBP|Avg: £8,533 GBP|-0.7%

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

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Retailer 16

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Retailer 19

November 1, 2026

Retailer 2£4,090 GBP

Retailer 8£4,390 GBP

Retailer 15£4,601 GBP

Retailer 19£5,007 GBP

Retailer 3£5,093 GBP

Retailer 14£5,094 GBP

Retailer 17£5,583 GBP

Retailer 11£5,706 GBP

Retailer 16£5,721 GBP

Retailer 4£6,045 GBP

Retailer 9£6,269 GBP

Retailer 12£6,348 GBP

Retailer 7£7,501 GBP

Retailer 18£7,883 GBP

Retailer 13£8,379 GBP

Retailer 10£10,801 GBP

Retailer 5£13,148 GBP

Retailer 6£17,827 GBP

Brilliant Earth£23,726 GBP

23 data points across 19 retailers

19 retailers£4,090 GBP to £23,726 GBP

Cheapest Retailer

£4,090 GBP

Retailer 2

£4,390 GBP

$5,882 USD

View

Retailer 3

£4,601 GBP

$6,165 USD

View

Retailer 4

£5,007 GBP

$6,709 USD

View

Retailer 5

£5,093 GBP

$6,824 USD

View

Retailer 6

£5,094 GBP

$6,825 USD

View

Retailer 7

£5,583 GBP

$7,480 USD

View

Final sale: no returns

Retailer 8

£5,706 GBP

$7,646 USD

View

Price last confirmed 19 days ago

Retailer 9

£5,721 GBP

$7,665 USD

View

B+

Retailer 10

£6,045 GBP

$8,100 USD

View

Retailer 11

£6,269 GBP

$8,400 USD

View

Price last confirmed 7 days ago

B+

Retailer 12

£6,348 GBP

View

Retailer 13

£7,501 GBP

$10,050 USD

View

B+

Retailer 14

£7,883 GBP

ZAR 170,635 ZAR

View

B+

Retailer 15

£8,379 GBP

€10,692 EUR

View

Retailer 16

£10,801 GBP

A$22,265 AUD

View

Price last confirmed 9 days ago

Retailer 17

£13,148 GBP

$17,617 USD

View

Retailer 18

£17,827 GBP

$23,886 USD

View

Most Expensive

Brilliant Earth

21726945A · Oct 31

£23,726 GBP

$31,790 USD

View

18 more retailers have this diamond

Prices start from £4,090 GBPSave up to £19,636 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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16.51ct Round

£4,090 GBP