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Marquise|Lab Grown|IGI

1.78ct F VS1 Marquise Lab Grown Diamond

VG • F/VS1 • IGI LG842642158

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG842642158

Diamond specifications and retailer prices

From £202 GBP
$271 USD
As of November 1, 2026
Save £756 GBP (79%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £1,509 GBP at Helzberg Diamonds · As of October 17, 2026
View at Helzberg Diamonds

About this 1.78ct lab-grown marquise diamond

This 1.78ct lab-grown marquise sits in the one-and-a-half to two carat band, graded F colour (colourless) and VS1 clarity (very-slightly-included), with a very-good cut grade and certified by IGI LG842642158 or 842642158. Listed at 4 retailers as of October 28, 2026, with a 374% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.78
Carat
F
Colour
VS1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.7°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG842642158
Dimensions12.82 × 6.20 × 3.92 mm
L/W Ratio2.07
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
12.82 mm6.20 mm1.78 ctF / VS1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG842642158
Side View
Table 61.0%Crown 35.7°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 63.2%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: £1,509 GBP|Low: £202 GBP|High: £1,509 GBP|Avg: £820 GBP
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
November 2, 2026
Retailer 3£202 GBP
Retailer 2£440 GBP
Retailer 4£958 GBP
Helzberg Diamonds£1,509 GBP

24 data points across 4 retailers

4 retailers£202 GBP to £958 GBP

A
Cheapest Retailer
-
£202 GBP
$271 USD
Final sale: no returns
A
Retailer 2
-
£440 GBP
View
B+
Retailer 3
-
£958 GBP
$1,285 USD
View
Most Expensive
Helzberg Diamonds
ZXZOKIMKIHLO · Oct 17
£1,509 GBP
$2,025 USD
View
Price last confirmed 16 days ago
3 more retailers have this diamond
Prices start from £202 GBPSave up to £756 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
1.78ct Marquise
£202 GBP