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Marquise|Lab Grown|IGI

8.57ct I VS1 Marquise Lab Grown Diamond

I/VS1 • IGI LG644481798

Certificate IGI LG644481798

Diamond specifications and retailer prices

From £4,657 GBP
$6,240 USD
As of October 30, 2026
Save £933 GBP (17%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £5,590 GBP at Kay Jewelers · As of November 1, 2026
View at Kay Jewelers

About this 8.57ct lab-grown marquise diamond

This 8.57ct lab-grown marquise sits in the over five carat band, graded I colour (near-colourless) and VS1 clarity (very-slightly-included) and certified by IGI LG644481798 or 644481798. Listed at 3 retailers as of October 30, 2026, with prices from £4,657 to £5,590, a £933 spread on the same certified stone. Kay Jewelers lists it at £5,590. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

8.57
Carat
I
Colour
VS1
Clarity
-
Cut

Specifications

Cut
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG644481798
Dimensions22.87 × 10.62 mm
L/W Ratio2.15
Top View
22.87 mm10.62 mm8.57 ctI / VS1
OriginLab Grown
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG644481798
Side View
Table 60.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 58.9%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £5,590 GBP|Low: £4,396 GBP|High: £6,836 GBP|Avg: £5,711 GBP|-18.2%
Kay Jewelers
Retailer 2
Retailer 3
April 27, 2026
Retailer 3£4,657 GBP
Kay Jewelers£5,590 GBP
Retailer 2£5,590 GBP

8 data points across 3 retailers

3 retailers£4,657 GBP to £5,590 GBP

B
Cheapest Retailer
-
£4,657 GBP
$6,240 USD
B
Retailer 2
-
£5,590 GBP
$7,490 USD
View
Most Expensive
B
Kay Jewelers
252024242 · Nov 1
£5,590 GBP
$7,490 USD
View
2 more retailers have this diamond
Prices start from £4,657 GBPSave up to £933 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
8.57ct Marquise
£4,657 GBP