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Cushion|Natural|IGI

0.51ct I SI1 Cushion Natural Diamond

VG • I/SI1 • IGI 815673863

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

Certificate IGI 815673863

Diamond specifications and retailer prices

From £277 GBP
₹35,410 INR
As of November 2, 2026
Save £572 GBP (67%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £849 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), with a very-good cut grade and certified by IGI 815673863. Listed at 10 retailers as of November 2, 2026, with prices from £277 to £849, a £572 spread on the same certified stone. MOH London lists it at £849. 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
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.2°
Pavilion angle36.6°
OriginNatural
Grading LabIGI
CertificateIGI 815673863
Dimensions4.67 × 4.62 × 2.91 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Top View
4.67 mm4.62 mm0.51 ctI / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 815673863
Side View
Table 60.0%Crown 32.2°Girdle: STK-VTKPavilion 36.6°Culet: NoneDepth 63.0%

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 2
Current: £849 GBP|Low: £277 GBP|High: £894 GBP|Avg: £480 GBP|-5.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 2£277 GBP
Retailer 9£339 GBP
Retailer 7£396 GBP
Retailer 8£421 GBP
Retailer 3£457 GBP
Retailer 11£465 GBP
Retailer 5£477 GBP
Retailer 10£491 GBP
Retailer 4£509 GBP
Retailer 6£567 GBP
MOH London£849 GBP

37 data points across 11 retailers

10 retailers£277 GBP to £849 GBP

A
Cheapest Retailer
-
£277 GBP
₹35,410 INR
B+
Retailer 2
-
£339 GBP
$455 USD
View
Final sale: no returns
B+
Retailer 3
-
£396 GBP
$531 USD
View
B+
Retailer 4
-
£421 GBP
$565 USD
View
B
Retailer 5
-
£465 GBP
$624 USD
View
B
Retailer 6
-
£477 GBP
View
B
Retailer 7
-
£491 GBP
$659 USD
View
B
Retailer 8
-
£509 GBP
€650 EUR
View
B
Retailer 9
-
£567 GBP
ZAR 12,297 ZAR
View
Most Expensive
B
MOH London
D356764C4 · Nov 2
£849 GBP
View
9 more retailers have this diamond
Prices start from £277 GBPSave up to £572 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
£277 GBP