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Cushion|Natural|GIA

0.40ct I SI1 Cushion Natural Diamond

EX • I/SI1 • GIA 6555183033

Certificate GIA 6555183033

Diamond specifications and retailer prices

From £226 GBP
₹28,869 INR
As of November 1, 2026
Save £499 GBP (69%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £725 GBP at MOH London · As of November 1, 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 I 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 6555183033. Listed at 10 retailers as of November 1, 2026, with prices from £226 to £725, a £499 spread on the same certified stone. MOH London lists it at £725. 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
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishVery Good
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 6555183033
Dimensions4.14 × 4.12 × 2.84 mm
L/W Ratio1.00
Culet sizeNone
Key to symbols
Twinning Wisp
Top View
4.14 mm4.12 mm0.40 ctI / SI1
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceMedium
CertificateGIA 6555183033
Side View
Table 62.0%CrownGirdle: THK-VTKPavilionCulet: NoneDepth 68.7%

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 1
Current: £725 GBP|Low: £226 GBP|High: £735 GBP|Avg: £460 GBP|-1.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 1, 2026
Retailer 2£226 GBP
Retailer 6£338 GBP
Retailer 3£386 GBP
Retailer 4£480 GBP
Retailer 5£487 GBP
Retailer 7£503 GBP
MOH London£725 GBP

38 data points across 7 retailers

10 retailers£226 GBP to £725 GBP

A
Cheapest Retailer
-
£226 GBP
₹28,869 INR
B+
Retailer 2
-
£338 GBP
$453 USD
View
B+
Retailer 3
-
£362 GBP
$485 USD
View
B+
Retailer 4
-
£363 GBP
$486 USD
View
B+
Retailer 5
-
£386 GBP
View
B
Retailer 6
-
£418 GBP
$560 USD
View
B
Retailer 7
-
£480 GBP
€612 EUR
View
B+
Retailer 8
-
£487 GBP
ZAR 10,543 ZAR
View
Retailer 9
-
£503 GBP
A$1,037 AUD
View
Price last confirmed 28 days ago
Most Expensive
B
MOH London
6D4E087F6 · Nov 1
£725 GBP
View
9 more retailers have this diamond
Prices start from £226 GBPSave up to £499 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
£226 GBP