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Marquise|Natural|IGI

1.51ct K SI1 Marquise Natural Diamond

EX • K/SI1 • IGI 803629208

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 803629208

Diamond specifications and retailer prices

From $4,275 AUD
As of November 6, 2026
Save $4,240 AUD (50%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $8,514 AUD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.51ct natural marquise diamond

This 1.51ct natural marquise sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 803629208. Listed at 15 retailers as of November 5, 2026, with prices from $4,275 to $8,514, a $4,240 spread on the same certified stone. NZ Jewellers lists it at $8,514. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.51
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.8°
Pavilion angle41.2°
OriginNatural
Grading LabIGI
CertificateIGI 803629208
Dimensions11.92 × 5.91 × 3.73 mm
L/W Ratio2.02
Girdle conditionFaceted
Top View
11.92 mm5.91 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 803629208
Side View
Table 61.0%Crown 34.8°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 63.1%

Caratlytics Score

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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: $8,514 AUD|Low: $4,275 AUD|High: $8,775 AUD|Avg: $5,689 AUD|-3.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
November 6, 2026
Retailer 2$4,275 AUD
Retailer 5$4,650 AUD
Retailer 8$4,670 AUD
Retailer 6$4,675 AUD
Retailer 14$4,723 AUD
Retailer 4$4,887 AUD
Retailer 9$5,023 AUD
Retailer 7$5,037 AUD
Retailer 10$5,042 AUD
Retailer 15$5,075 AUD
Retailer 3$5,381 AUD
Retailer 11$5,555 AUD
Retailer 12$5,964 AUD
Retailer 13$8,149 AUD
NZ Jewellers$8,514 AUD

30 data points across 15 retailers

15 retailers$4,275 AUD to $8,514 AUD

A
Cheapest Retailer
-
$4,275 AUD
A
Retailer 2
-
$4,650 AUD
View
A
Retailer 3
-
$4,670 AUD
View
A
Retailer 4
-
$4,675 AUD
View
B+
Retailer 5
-
$4,723 AUD
View
A
Retailer 6
-
$4,887 AUD
View
A
Retailer 7
-
$5,023 AUD
View
Retailer 8
-
$5,037 AUD
View
Price last confirmed 9 days ago
A
Retailer 9
-
$5,042 AUD
View
A
Retailer 10
-
$5,075 AUD
View
A
Retailer 11
-
$5,381 AUD
View
A
Retailer 12
-
$5,555 AUD
View
A
Retailer 13
-
$5,964 AUD
View
B+
Retailer 14
-
$8,149 AUD
View
Most Expensive
B+
NZ Jewellers
ca66ec14-a278-4bb1-b408-71a51fcce9b5 · Nov 5
$8,514 AUD
$5,850 USD
View
14 more retailers have this diamond
Prices start from $4,275 AUDSave up to $4,240 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
1.51ct Marquise
$4,275 AUD