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Radiant|Lab Grown|IGI

18.07ct G VS1 Radiant Lab Grown Diamond

ID • G/VS1 • IGI LG830673978

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG830673978

Diamond specifications and retailer prices

From £5,769 GBP
$7,730 USD
As of November 2, 2026
Save £16,136 GBP (74%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £21,905 GBP at Brilliant Earth · As of October 31, 2026
View at Brilliant Earth

About this 18.07ct lab-grown radiant diamond

This 18.07ct lab-grown radiant 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 LG830673978 or 830673978. Listed at 10 retailers as of October 31, 2026, with prices from £5,769 to £21,905, a £16,136 spread on the same certified stone. Brilliant Earth lists it at £21,905. 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

18.07
Carat
G
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle49.9°
Pavilion angle32.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG830673978
Dimensions17.72 × 12.54 × 8.47 mm
L/W Ratio1.41
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
17.72 mm12.54 mm18.07 ctG / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG830673978
Side View
Table 65.0%Crown 49.9°Girdle: Slightly ThickPavilion 32.7°Culet: NoneDepth 67.5%

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 2
Current: £21,905 GBP|Low: £5,769 GBP|High: £22,853 GBP|Avg: £11,738 GBP|-4.1%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 2, 2026
Retailer 8£5,769 GBP
Retailer 7£6,255 GBP
Retailer 2£7,220 GBP
Retailer 6£8,564 GBP
Retailer 5£8,966 GBP
Retailer 4£10,588 GBP
Retailer 3£11,069 GBP
Retailer 9£14,751 GBP
Retailer 10£19,885 GBP
Brilliant Earth£21,905 GBP

43 data points across 10 retailers

10 retailers£5,769 GBP to £21,905 GBP

B+
Cheapest Retailer
-
£5,769 GBP
$7,730 USD
B+
Retailer 2
-
£6,255 GBP
$8,381 USD
View
B+
Retailer 3
-
£7,220 GBP
View
B
Retailer 4
-
£8,564 GBP
$11,475 USD
View
B+
Retailer 5
-
£8,966 GBP
ZAR 194,084 ZAR
View
B
Retailer 6
-
£10,588 GBP
€13,511 EUR
View
B
Retailer 7
-
£11,069 GBP
A$22,818 AUD
View
B
Retailer 8
-
£14,751 GBP
$19,765 USD
View
B
Retailer 9
-
£19,885 GBP
$26,644 USD
View
Most Expensive
B
Brilliant Earth
21633058A · Oct 31
£21,905 GBP
$29,350 USD
View
9 more retailers have this diamond
Prices start from £5,769 GBPSave up to £16,136 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.

B+
18.07ct Radiant
£5,769 GBP