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Cushion|Natural|IGI

0.51ct K SI1 Cushion Natural Diamond

VG • K/SI1 • IGI 741597205

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI 741597205

Diamond specifications and retailer prices

From £193 GBP
As of November 6, 2026
Save £423 GBP (69%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £616 GBP at MOH London · As of November 4, 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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI 741597205. Listed at 6 retailers as of November 4, 2026, with prices from £193 to £616, a £423 spread on the same certified stone. MOH London lists it at £616. 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
K
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle41.6°
Pavilion angle34.4°
OriginNatural
Grading LabIGI
CertificateIGI 741597205
Dimensions4.50 × 4.37 × 3.04 mm
L/W Ratio1.03
Girdle conditionFaceted
Culet sizePointed
Top View
4.50 mm4.37 mm0.51 ctK / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI 741597205
Side View
Table 65.0%Crown 41.6°Girdle: MED-STKPavilion 34.4°Culet: NoneDepth 69.6%

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 6
Current: £616 GBP|Low: £193 GBP|High: £639 GBP|Avg: £402 GBP|-3.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 2£193 GBP
Retailer 4£355 GBP
Retailer 6£364 GBP
Retailer 5£414 GBP
Retailer 3£489 GBP
MOH London£616 GBP

41 data points across 6 retailers

6 retailers£193 GBP to £616 GBP

A
Cheapest Retailer
-
£193 GBP
B+
Retailer 2
-
£355 GBP
View
B+
Retailer 3
-
£364 GBP
View
B+
Retailer 4
-
£414 GBP
View
B+
Retailer 5
-
£489 GBP
View
Most Expensive
B
MOH London
B678EC5D3 · Nov 4
£616 GBP
View
5 more retailers have this diamond
Prices start from £193 GBPSave up to £423 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
0.51ct Cushion
£193 GBP