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Round|Lab Grown|IGI

8.51ct G VS1 Round Lab Grown Diamond

EX • G/VS1 • IGI LG823623420

Shape and cutting style on the report: Round brilliant

Certificate IGI LG823623420

Diamond specifications and retailer prices

From £1,134 GBP
$1,519 USD
As of October 31, 2026
Save £1,824 GBP (62%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £6,418 GBP at Brilliant Earth · As of September 28, 2026
View at Brilliant Earth

About this 8.51ct lab-grown round diamond

This 8.51ct 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 LG823623420 or 823623420. Listed at 4 retailers as of October 31, 2026, with a 161% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

8.51
Carat
G
Colour
VS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.7°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG823623420
Dimensions12.93 × 12.97 × 8.14 mm
L/W Ratio1.00
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
12.93 mm12.97 mm8.51 ctG / VS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG823623420
Side View
Table 56.0%Crown 34.7°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.9%

Caratlytics Score

How it works →
A
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 31
Current: £1,134 GBP|Low: £1,134 GBP|High: £3,127 GBP|Avg: £1,865 GBP
Retailer 1
Retailer 2
Retailer 3
Retailer 4
October 30, 2026
Retailer 1£1,134 GBP
Retailer 3£1,515 GBP
Retailer 4£1,626 GBP
Retailer 2£2,958 GBP

17 data points across 4 retailers

4 retailers£1,134 GBP to £2,958 GBP

A
Cheapest Retailer
-
£1,134 GBP
$1,519 USD
Final sale: no returns
B+
Retailer 2
-
£1,515 GBP
$2,030 USD
View
B+
Retailer 3
-
£2,958 GBP
$3,963 USD
View
Most Expensive
Brilliant Earth
21233577A · Sep 28
£6,418 GBP
$8,600 USD
View
Price last confirmed 34 days ago
3 more retailers have this diamond
Prices start from £1,134 GBPSave up to £1,824 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.

A
8.51ct Round
£1,134 GBP