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Cushion|Lab Grown|IGI

4.78ct F VS1 Cushion Lab Grown Diamond

EX • F/VS1 • IGI LG819630337

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG819630337

Diamond specifications and retailer prices

From £521 GBP
$699 USD
As of November 1, 2026
Save £200 GBP (28%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £1,665 GBP at Brilliance · As of October 5, 2026
View at Brilliance

About this 4.78ct lab-grown cushion diamond

This 4.78ct lab-grown cushion sits in the three to five carat band, graded F colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG819630337 or 819630337. Listed at 3 retailers as of October 28, 2026, with a 38% 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

4.78
Carat
F
Colour
VS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG819630337
Dimensions9.86 × 9.83 × 6.51 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
9.86 mm9.83 mm4.78 ctF / VS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG819630337
Side View
Table 63.0%Crown 34.4°Girdle: STK-THKPavilion 40.1°Culet: NoneDepth 66.2%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: £1,665 GBP|Low: £521 GBP|High: £3,935 GBP|Avg: £1,597 GBP|-10.1%
Brilliance
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 27, 2026
Retailer 2£521 GBP
Retailer 4£648 GBP
Retailer 3£721 GBP
Retailer 5£889 GBP
Brilliance£1,665 GBP
Retailer 7£2,044 GBP
Retailer 6£3,935 GBP

9 data points across 7 retailers

3 retailers£521 GBP to £721 GBP

A
Cheapest Retailer
-
£521 GBP
$699 USD
Final sale: no returns
B+
Retailer 2
-
£721 GBP
$968 USD
View
Most Expensive
Brilliance
D45376121 · Oct 5
£1,665 GBP
$2,235 USD
View
Price last confirmed 28 days ago
2 more retailers have this diamond
Prices start from £521 GBPSave up to £200 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
4.78ct Cushion
£521 GBP