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Cushion · Old Mine|Natural|GIA

0.51ct I SI1 Cushion Natural Diamond

I/SI1 • GIA 6565214855

Certificate GIA 6565214855

Diamond specifications and retailer prices

From £402 GBP
$540 USD
As of November 2, 2026
Save £777 GBP (66%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £1,542 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 0.51ct natural cushion diamond

This 0.51ct natural cushion sits in the half to three-quarter carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included) and certified by GIA 6565214855. Listed at 4 retailers as of November 2, 2026, with a 193% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

0.51
Carat
I
Colour
SI1
Clarity
-
Cut

Specifications

Cut
PolishExcellent
SymmetryFair
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 6565214855
Dimensions4.74 × 4.62 × 3.00 mm
L/W Ratio1.03
Culet sizeVery Large
Top View
4.74 mm4.62 mm0.51 ctI / SI1
OriginNatural
PolishExcellent
SymmetryFair
FluorescenceNone
CertificateGIA 6565214855
Side View
Table 55.0%CrownGirdle: MED-VTKPavilionCulet: Very LargeDepth 64.8%

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: Nov 2
Current: £1,542 GBP|Low: £402 GBP|High: £1,542 GBP|Avg: £918 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
November 2, 2026
Retailer 4£402 GBP
Retailer 3£939 GBP
Retailer 2£1,179 GBP
MOH London£1,542 GBP

3 data points across 4 retailers

4 retailers£402 GBP to £1,179 GBP

B+
Cheapest Retailer
-
£402 GBP
$540 USD
C
Retailer 2
-
£939 GBP
$1,260 USD
View
C
Retailer 3
-
£1,179 GBP
€1,507 EUR
View
Most Expensive
MOH London
240468541 · Nov 2
£1,542 GBP
View
Price under review
3 more retailers have this diamond
Prices start from £402 GBPSave up to £777 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+
0.51ct Cushion
£402 GBP