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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 $384 AUD
As of November 6, 2026
Save $589 AUD (61%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $1,238 AUD 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: $1,238 AUD|Low: $384 AUD|High: $1,275 AUD|Avg: $811 AUD|-2.9%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 2$384 AUD
Retailer 3$712 AUD
Retailer 6$723 AUD
Retailer 4$827 AUD
Retailer 5$974 AUD
MOH London$1,238 AUD

39 data points across 6 retailers

6 retailers$384 AUD to $974 AUD

A
Cheapest Retailer
-
$384 AUD
B+
Retailer 2
-
$712 AUD
View
B+
Retailer 3
-
$723 AUD
View
B+
Retailer 4
-
$827 AUD
View
B
Retailer 5
-
$974 AUD
View
Most Expensive
MOH London
9579B6285 · Oct 29
$1,238 AUD
£670 GBP
View
Price last confirmed 8 days ago
5 more retailers have this diamond
Prices start from $384 AUDSave up to $589 AUD

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
$384 AUD