CaratHunter
Plans
Marquise|Lab Grown|IGI

3.78ct G VS1 Marquise Lab Grown Diamond

EX • G/VS1 • IGI LG812649575

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG812649575

Diamond specifications and retailer prices

From £413 GBP
$553 USD
As of November 1, 2026
Save £2,222 GBP (84%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £2,724 GBP at Brilliant Earth · As of October 1, 2026
View at Brilliant Earth

About this 3.78ct lab-grown marquise diamond

This 3.78ct lab-grown marquise sits in the three to five carat band, graded G colour (near-colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG812649575 or 812649575. Listed at 6 retailers as of October 31, 2026, with a 538% 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

3.78
Carat
G
Colour
VS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.7°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG812649575
Dimensions15.55 × 8.13 × 5.26 mm
L/W Ratio1.91
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
15.55 mm8.13 mm3.78 ctG / VS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG812649575
Side View
Table 56.0%Crown 36.7°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 64.7%

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: Nov 1
Current: £2,724 GBP|Low: £413 GBP|High: £2,724 GBP|Avg: £1,697 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 27, 2026
Retailer 4£413 GBP
Retailer 3£573 GBP
Retailer 7£698 GBP
Retailer 6£1,497 GBP
Retailer 5£2,321 GBP
Retailer 2£2,635 GBP
Brilliant Earth£2,724 GBP

16 data points across 7 retailers

6 retailers£413 GBP to £2,635 GBP

A
Cheapest Retailer
-
£413 GBP
$553 USD
Final sale: no returns
B+
Retailer 2
-
£573 GBP
$768 USD
View
B+
Retailer 3
-
£1,497 GBP
$2,006 USD
View
B
Retailer 4
-
£2,321 GBP
$3,110 USD
View
B
Retailer 5
-
£2,635 GBP
$3,530 USD
View
Most Expensive
Brilliant Earth
21279979A · Oct 1
£2,724 GBP
$3,650 USD
View
Price last confirmed 31 days ago
5 more retailers have this diamond
Prices start from £413 GBPSave up to £2,222 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
£413 GBP