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Cushion|Natural|GIA

0.90ct K SI1 Cushion Natural Diamond

VG • K/SI1 • GIA 6512878823

Certificate GIA 6512878823

Diamond specifications and retailer prices

From £396 GBP
As of November 6, 2026
Save £588 GBP (60%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £984 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 0.9ct natural cushion diamond

This 0.9ct natural cushion sits in the just-under-one-carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a very-good cut grade stated by the retailer rather than the lab and certified by GIA 6512878823. Listed at 8 retailers as of November 4, 2026, with prices from £396 to £984, a £588 spread on the same certified stone. MOH London lists it at £984. 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

0.90
Carat
K
Colour
SI1
Clarity
Very Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Very Good
PolishVery Good
SymmetryVery Good
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6512878823
Dimensions5.72 × 5.71 × 3.81 mm
L/W Ratio1.00
Top View
5.72 mm5.71 mm0.90 ctK / SI1
OriginNatural
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceFaint
CertificateGIA 6512878823
Side View
Table 63.0%CrownGirdle: STK-VTKPavilionCulet: NoneDepth 66.8%

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: £984 GBP|Low: £396 GBP|High: £997 GBP|Avg: £647 GBP|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 2£396 GBP
Retailer 6£459 GBP
Retailer 4£563 GBP
Retailer 5£645 GBP
Retailer 3£760 GBP
MOH London£984 GBP

43 data points across 6 retailers

8 retailers£396 GBP to £984 GBP

A
Cheapest Retailer
-
£396 GBP
B+
Retailer 2
-
£459 GBP
View
B+
Retailer 3
-
£563 GBP
View
B+
Retailer 4
-
£569 GBP
View
B+
Retailer 5
-
£645 GBP
View
B+
Retailer 6
-
£758 GBP
View
B+
Retailer 7
-
£760 GBP
View
Most Expensive
B
MOH London
92853AFB3 · Nov 4
£984 GBP
View
7 more retailers have this diamond
Prices start from £396 GBPSave up to £588 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
0.90ct Cushion
£396 GBP