Marquise|Lab Grown|GCAL

0.42ct G SI1 Marquise Lab Grown Diamond

VG • G/SI1 • GCAL 311790048

Shape and cutting style on the report: Marquise brilliant

Certificate GCAL 311790048

Diamond specifications and retailer prices

From £89 GBP
$119 USD
As of November 2, 2026
Save £303 GBP (77%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £1,017 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 0.42ct lab-grown marquise diamond

This 0.42ct lab-grown marquise sits in the sub-half-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by GCAL 311790048. Listed at 7 retailers as of October 31, 2026, with a 341% 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

0.42
Carat
G
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryGood
FluorescenceNone
Crown angle34°
Pavilion angle41°
OriginLab Grown
Grading LabGCAL
CertificateGCAL 311790048
Dimensions8.00 × 3.86 × 2.34 mm
L/W Ratio2.07
Culet sizeNone
Top View
8.00 mm3.86 mm0.42 ctG / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryGood
FluorescenceNone
CertificateGCAL 311790048
Side View
Table 61.0%Crown 34°GirdlePavilion 41°Culet: NoneDepth 60.7%

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 2
Current: £1,017 GBP|Low: £87 GBP|High: £1,052 GBP|Avg: £287 GBP|-2.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 1, 2026
Retailer 3£89 GBP
Retailer 4£104 GBP
Retailer 7£112 GBP
Retailer 5£118 GBP
Retailer 8£193 GBP
Retailer 6£205 GBP
Retailer 2£391 GBP
MOH London£1,017 GBP

21 data points across 8 retailers

7 retailers£89 GBP to £391 GBP

A
Cheapest Retailer
-
£89 GBP
$119 USD
B+
Retailer 2
-
£104 GBP
$139 USD
View
B+
Retailer 3
-
£112 GBP
$150 USD
View
A
Retailer 4
-
£118 GBP
$158 USD
View
B
Retailer 5
-
£205 GBP
CA$382 CAD
View
B
Retailer 6
-
£391 GBP
$525 USD
View
Most Expensive
MOH London
311790048 · Nov 1
£1,017 GBP
View
Price under review
6 more retailers have this diamond
Prices start from £89 GBPSave up to £303 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
0.42ct Marquise
£89 GBP