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Cushion|Natural|IGI

0.51ct I SI2 Cushion Natural Diamond

VG • I/SI2 • IGI 749531711

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

Certificate IGI 749531711

Diamond specifications and retailer prices

From £204 GBP
As of November 6, 2026
Save £311 GBP (60%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £658 GBP at MOH London · As of October 29, 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 SI2 clarity (slightly-included), with a very-good cut grade and certified by IGI 749531711. Listed at 5 retailers as of November 6, 2026, with a 152% 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
SI2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle39.3°
Pavilion angle35.5°
OriginNatural
Grading LabIGI
CertificateIGI 749531711
Dimensions4.40 × 4.36 × 3.08 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Top View
4.40 mm4.36 mm0.51 ctI / SI2
OriginNatural
CutVery Good
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI 749531711
Side View
Table 64.0%Crown 39.3°Girdle: MED-VTKPavilion 35.5°Culet: NoneDepth 70.6%

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: £658 GBP|Low: £204 GBP|High: £679 GBP|Avg: £429 GBP|-3.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 2£204 GBP
Retailer 4£381 GBP
Retailer 5£391 GBP
Retailer 6£431 GBP
Retailer 3£515 GBP
MOH London£658 GBP

41 data points across 6 retailers

5 retailers£204 GBP to £515 GBP

A
Cheapest Retailer
-
£204 GBP
B+
Retailer 2
-
£381 GBP
View
B+
Retailer 3
-
£391 GBP
View
B
Retailer 4
-
£515 GBP
View
Most Expensive
MOH London
AA90C052B · Oct 29
£658 GBP
View
Price last confirmed 8 days ago
4 more retailers have this diamond
Prices start from £204 GBPSave up to £311 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
£204 GBP