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Marquise|Natural|GIA

0.40ct H SI1 Marquise Natural Diamond

EX • H/SI1 • GIA 6555590918

Certificate GIA 6555590918

Diamond specifications and retailer prices

From £204 GBP
₹26,106 INR
As of November 2, 2026
Save £449 GBP (69%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £653 GBP at MOH London · As of November 1, 2026
View at MOH London

About this 0.4ct natural marquise diamond

This 0.4ct natural marquise sits in the sub-half-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6555590918. Listed at 8 retailers as of November 1, 2026, with prices from £204 to £653, a £449 spread on the same certified stone. MOH London lists it at £653. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

0.40
Carat
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6555590918
Dimensions7.08 × 3.81 × 2.41 mm
L/W Ratio1.86
Girdle conditionThin to Extremely Thick
Key to symbols
Crystal, Feather
Top View
7.08 mm3.81 mm0.40 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6555590918
Side View
Table 58.0%CrownGirdle: THN-XTKPavilionCulet: NoneDepth 63.3%

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: £653 GBP|Low: £204 GBP|High: £761 GBP|Avg: £405 GBP|-14.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 2, 2026
Retailer 2£204 GBP
Retailer 4£238 GBP
Retailer 5£299 GBP
Retailer 3£496 GBP
MOH London£653 GBP

46 data points across 5 retailers

8 retailers£204 GBP to £653 GBP

A
Cheapest Retailer
-
£204 GBP
₹26,106 INR
A
Retailer 2
-
£238 GBP
HK$2,500 HKD
View
Retailer 3
-
£299 GBP
SGD 543 SGD
View
Price last confirmed 8 days ago
Retailer 4
-
£323 GBP
$434 USD
View
Price last confirmed 32 days ago
Retailer 5
-
£329 GBP
$442 USD
View
Price last confirmed 26 days ago
B
Retailer 6
-
£496 GBP
View
Most Expensive
B
MOH London
A70C9CD1C · Nov 1
£653 GBP
View
6 more retailers have this diamond
Prices start from £204 GBPSave up to £449 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
0.40ct Marquise
£204 GBP