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Round|Lab Grown|GIA

0.40ct F SI1 Round Lab Grown Diamond

VG • F/SI1 • GIA 6241929391

Certificate GIA 6241929391

Diamond specifications and retailer prices

From £417 GBP
As of November 2, 2026
Save £353 GBP (46%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £770 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 0.4ct lab-grown round diamond

This 0.4ct lab-grown round sits in the sub-half-carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by GIA 6241929391. Listed at 3 retailers as of November 1, 2026, with prices from £417 to £770, a £353 spread on the same certified stone. MOH London lists it at £770. 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

0.40
Carat
F
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginLab Grown
Grading LabGIA
CertificateGIA 6241929391
Dimensions4.56 × 4.64 × 2.98 mm
L/W Ratio1.02
Top View
4.56 mm4.64 mm0.40 ctF / SI1
OriginLab Grown
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 6241929391
Side View
Table 54.0%CrownGirdlePavilionCulet: NoneDepth 64.8%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 2
Current: £770 GBP|Low: £400 GBP|High: £819 GBP|Avg: £562 GBP|-4.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
November 2, 2026
Retailer 2£417 GBP
Retailer 3£515 GBP
Retailer 4£560 GBP
MOH London£770 GBP

39 data points across 4 retailers

3 retailers£417 GBP to £770 GBP

B
Cheapest Retailer
-
£417 GBP
B
Retailer 2
-
£515 GBP
€657 EUR
View
Most Expensive
B
MOH London
C0AE144D9 · Nov 1
£770 GBP
View
2 more retailers have this diamond
Prices start from £417 GBPSave up to £353 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.

B
0.40ct Round
£417 GBP