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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 $254 USD
As of November 6, 2026
Save $345 USD (58%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: $914 USD 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
Color
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: $914 USD|Low: $254 USD|High: $921 USD|Avg: $588 USD|+0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 6, 2026
Retailer 2$254 USD
Retailer 3$527 USD
Retailer 5$555 USD
Retailer 4$710 USD
MOH London$914 USD

39 data points across 5 retailers

4 retailers$254 USD to $599 USD

A
Cheapest Retailer
-
$254 USD
B+
Retailer 2
-
$527 USD
View
B+
Retailer 3
-
$599 USD
View
Most Expensive
MOH London
A82C2EC54 · Oct 18
$914 USD
£720 GBP
View
Price last confirmed 18 days ago
3 more retailers have this diamond
Prices start from $254 USDSave up to $345 USD

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
$254 USD