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Marquise|Natural|IGI

0.51ct K SI1 Marquise Natural Diamond

VG • K/SI1 • IGI 741597178

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 741597178

Diamond specifications and retailer prices

From £196 GBP
As of November 6, 2026
Save £301 GBP (61%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: £632 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise 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 741597178. Listed at 6 retailers as of November 3, 2026, with a 153% 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
K
Colour
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle32°
Pavilion angle41.8°
OriginNatural
Grading LabIGI
CertificateIGI 741597178
Dimensions7.75 × 4.25 × 2.71 mm
L/W Ratio1.82
Girdle conditionFaceted
Culet sizePointed
Top View
7.75 mm4.25 mm0.51 ctK / SI1
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI 741597178
Side View
Table 61.0%Crown 32°Girdle: MED-STKPavilion 41.8°Culet: NoneDepth 63.8%

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: £632 GBP|Low: £196 GBP|High: £651 GBP|Avg: £414 GBP|-2.9%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 2£196 GBP
Retailer 3£363 GBP
Retailer 6£369 GBP
Retailer 4£422 GBP
Retailer 5£497 GBP
MOH London£632 GBP

39 data points across 6 retailers

6 retailers£196 GBP to £497 GBP

A
Cheapest Retailer
-
£196 GBP
B+
Retailer 2
-
£363 GBP
View
B+
Retailer 3
-
£369 GBP
View
B+
Retailer 4
-
£422 GBP
View
B
Retailer 5
-
£497 GBP
View
Most Expensive
MOH London
9579B6285 · Oct 29
£632 GBP
View
Price last confirmed 8 days ago
5 more retailers have this diamond
Prices start from £196 GBPSave up to £301 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 Marquise
£196 GBP