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Marquise|Lab Grown|IGI

3.78ct F VS2 Marquise Lab Grown Diamond

ID • F/VS2 • IGI LG799689920

Shape and cutting style on the report: Hexagonal modified brilliant

Certificate IGI LG799689920

Diamond specifications and retailer prices

From £991 GBP
$1,330 USD
As of November 3, 2026
Save £2,016 GBP (67%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £3,007 GBP at Taylor and Hart · As of October 31, 2026
View at Taylor and Hart

About this 3.78ct lab-grown marquise diamond

This 3.78ct lab-grown marquise sits in the three to five carat band, graded F colour (colourless) and VS2 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG799689920 or 799689920. Listed at 7 retailers as of October 31, 2026, with prices from £991 to £3,007, a £2,016 spread on the same certified stone. Taylor and Hart lists it at £3,007. 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

3.78
Carat
F
Colour
VS2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle42.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG799689920
Dimensions14.94 × 7.67 × 4.90 mm
L/W Ratio1.95
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
14.94 mm7.67 mm3.78 ctF / VS2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG799689920
Side View
Table 61.0%Crown 35.2°Girdle: STK-THKPavilion 42.9°Culet: NoneDepth 63.9%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 3
Current: £1,377 GBP|Low: £991 GBP|High: £3,007 GBP|Avg: £2,224 GBP|+11.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Taylor and Hart
November 2, 2026
Retailer 4£991 GBP
Retailer 3£1,372 GBP
Retailer 1£1,377 GBP
Retailer 8£1,724 GBP
Retailer 5£2,787 GBP
Retailer 7£2,844 GBP
Retailer 6£2,895 GBP
Retailer 2£2,925 GBP
Taylor and Hart£3,007 GBP

26 data points across 9 retailers

7 retailers£991 GBP to £3,007 GBP

A
Cheapest Retailer
-
£991 GBP
$1,330 USD
B+
Retailer 2
-
£1,372 GBP
€1,754 EUR
View
B+
Retailer 3
-
£1,377 GBP
$1,848 USD
View
B
Retailer 4
-
£2,787 GBP
$3,740 USD
View
B
Retailer 5
-
£2,895 GBP
SGD 5,250 SGD
View
B
Retailer 6
-
£2,925 GBP
View
Most Expensive
B
Taylor and Hart
CX88C4E · Oct 31
£3,007 GBP
$4,035 USD
View
6 more retailers have this diamond
Prices start from £991 GBPSave up to £2,016 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
3.78ct Marquise
£991 GBP