CaratHunter
Plans
Round|Lab Grown|GIA

0.40ct H SI1 Round Lab Grown Diamond

VG • H/SI1 • GIA 2557262584

Certificate GIA 2557262584

Diamond specifications and retailer prices

From £476 GBP
€608 EUR
As of October 29, 2026
Save £117 GBP (20%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £1,479 GBP at MOH London · As of October 26, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by GIA 2557262584. Listed at 3 retailers as of October 29, 2026, with a relatively tight 25% spread, which is unusual at this carat range and suggests competitive pricing across the listings. 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
H
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginLab Grown
Grading LabGIA
CertificateGIA 2557262584
Dimensions4.56 × 4.61 × 2.96 mm
L/W Ratio1.01
Culet sizeNone
Top View
4.56 mm4.61 mm0.40 ctH / SI1
OriginLab Grown
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 2557262584
Side View
Table 55.0%CrownGirdlePavilionCulet: NoneDepth 64.4%

Caratlytics Score

How it works →
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: Oct 29
Current: £1,479 GBP|Low: £465 GBP|High: £1,529 GBP|Avg: £744 GBP|-1.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
October 30, 2026
Retailer 3£476 GBP
Retailer 4£511 GBP
Retailer 2£593 GBP
MOH London£1,479 GBP

32 data points across 4 retailers

3 retailers£476 GBP to £593 GBP

B
Cheapest Retailer
-
£476 GBP
€608 EUR
B
Retailer 2
-
£593 GBP
$795 USD
View
Most Expensive
MOH London
2557262584 · Oct 26
£1,479 GBP
View
Price under review
2 more retailers have this diamond
Prices start from £476 GBPSave up to £117 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
£476 GBP