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Cushion|Natural|GIA

0.40ct D SI2 Cushion Natural Diamond

VG • D/SI2 • GIA 2121779507

Certificate GIA 2121779507

Diamond specifications and retailer prices

From £458 GBP
As of October 31, 2026
Save £453 GBP (50%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £911 GBP at MOH London · As of October 25, 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 D colour (colourless) and SI2 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 2121779507. Listed at 4 retailers as of October 25, 2026, with prices from £458 to £911, a £453 spread on the same certified stone. MOH London lists it at £911. 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
D
Colour
SI2
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishGood
SymmetryVery Good
FluorescenceStrong
OriginNatural
Grading LabGIA
CertificateGIA 2121779507
Dimensions7.79 × 3.62 × 2.24 mm
L/W Ratio2.15
Culet sizeNone
Top View
7.79 mm3.62 mm0.40 ctD / SI2
OriginNatural
CutVery Good
PolishGood
SymmetryVery Good
FluorescenceStrong
CertificateGIA 2121779507
Side View
Table 65.0%CrownGirdle: THK-ETKPavilionCulet: NoneDepth 61.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: £911 GBP|Low: £427 GBP|High: £921 GBP|Avg: £622 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
October 31, 2026
Retailer 2£458 GBP
Retailer 4£540 GBP
Retailer 3£589 GBP
MOH London£911 GBP

42 data points across 4 retailers

4 retailers£458 GBP to £911 GBP

B+
Cheapest Retailer
-
£458 GBP
B+
Retailer 2
-
£540 GBP
View
B
Retailer 3
-
£589 GBP
€751 EUR
View
Most Expensive
B
MOH London
0B4A19B34 · Oct 25
£911 GBP
View
3 more retailers have this diamond
Prices start from £458 GBPSave up to £453 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 Cushion
£458 GBP