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Marquise|Natural|IGI

0.51ct K SI1 Marquise Natural Diamond

VG • K/SI1 • IGI 442043282

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 442043282

Diamond specifications and retailer prices

From £189 GBP
As of November 6, 2026
Save £256 GBP (58%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £679 GBP at MOH London · As of October 18, 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 442043282. Listed at 4 retailers as of November 5, 2026, with a 136% 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
PolishVery Good
SymmetryGood
FluorescenceNone
Crown angle35.6°
Pavilion angle40.6°
OriginNatural
Grading LabIGI
CertificateIGI 442043282
Dimensions7.32 × 4.18 × 2.70 mm
L/W Ratio1.75
Girdle conditionFaceted
Culet sizeNone
Top View
7.32 mm4.18 mm0.51 ctK / SI1
OriginNatural
CutVery Good
PolishVery Good
SymmetryGood
FluorescenceNone
CertificateIGI 442043282
Side View
Table 54.5%Crown 35.6°Girdle: STK-VTKPavilion 40.6°Culet: NoneDepth 64.6%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: £679 GBP|Low: £189 GBP|High: £684 GBP|Avg: £437 GBP|+0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 6, 2026
Retailer 2£189 GBP
Retailer 3£392 GBP
Retailer 5£412 GBP
Retailer 4£528 GBP
MOH London£679 GBP

39 data points across 5 retailers

4 retailers£189 GBP to £445 GBP

A
Cheapest Retailer
-
£189 GBP
B+
Retailer 2
-
£392 GBP
View
B+
Retailer 3
-
£445 GBP
View
Most Expensive
MOH London
A82C2EC54 · Oct 18
£679 GBP
View
Price last confirmed 18 days ago
3 more retailers have this diamond
Prices start from £189 GBPSave up to £256 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
£189 GBP