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Cushion|Natural|GIA

0.40ct H SI2 Cushion Natural Diamond

EX • H/SI2 • GIA 6551384216

Certificate GIA 6551384216

Diamond specifications and retailer prices

From £149 GBP
As of November 6, 2026
Save £341 GBP (70%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £491 GBP at MOH London · As of November 7, 2026
View at MOH London

About this 0.4ct natural cushion diamond

This 0.4ct natural cushion sits in the sub-half-carat band, graded H colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6551384216. Listed at 6 retailers as of November 6, 2026, with prices from £149 to £491, a £341 spread on the same certified stone. MOH London lists it at £491. 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
SI2
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6551384216
Dimensions5.16 × 3.76 × 2.56 mm
L/W Ratio1.37
Girdle conditionThick to Extremely Thick
Key to symbols
Cloud
Top View
5.16 mm3.76 mm0.40 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 6551384216
Side View
Table 65.0%CrownGirdle: THK-XTKPavilionCulet: NoneDepth 68.0%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £491 GBP|Low: £149 GBP|High: £579 GBP|Avg: £311 GBP|-15.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 7, 2026
Retailer 2£149 GBP
Retailer 5£182 GBP
Retailer 6£228 GBP
Retailer 4£365 GBP
Retailer 3£430 GBP
MOH London£491 GBP

35 data points across 6 retailers

6 retailers£149 GBP to £491 GBP

A
Cheapest Retailer
-
£149 GBP
A
Retailer 2
-
£182 GBP
View
Retailer 3
-
£228 GBP
View
Price last confirmed 13 days ago
B+
Retailer 4
-
£365 GBP
View
B+
Retailer 5
-
£430 GBP
View
Most Expensive
B
MOH London
9CA723881 · Nov 7
£491 GBP
View
5 more retailers have this diamond
Prices start from £149 GBPSave up to £341 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 Cushion
£149 GBP