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 $2,937 USD
As of November 6, 2026
Save $2,913 USD (50%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $5,850 USD 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 $2,937 to $5,850, a $2,913 spread on the same certified stone. NZ Jewellers lists it at $5,850. 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
Color
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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Price History

Last verified: Nov 6
Current: $5,850 USD|Low: $2,937 USD|High: $6,029 USD|Avg: $3,909 USD|-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$2,937 USD
Retailer 5$3,195 USD
Retailer 8$3,209 USD
Retailer 6$3,212 USD
Retailer 14$3,245 USD
Retailer 4$3,358 USD
Retailer 9$3,451 USD
Retailer 7$3,461 USD
Retailer 10$3,464 USD
Retailer 15$3,487 USD
Retailer 3$3,697 USD
Retailer 11$3,817 USD
Retailer 12$4,098 USD
Retailer 13$5,599 USD
NZ Jewellers$5,850 USD

30 data points across 15 retailers

15 retailers$2,937 USD to $5,850 USD

A
Cheapest Retailer
-
$2,937 USD
A
Retailer 2
-
$3,195 USD
View
A
Retailer 3
-
$3,209 USD
View
A
Retailer 4
-
$3,212 USD
View
B+
Retailer 5
-
$3,245 USD
View
A
Retailer 6
-
$3,358 USD
View
A
Retailer 7
-
$3,451 USD
View
Retailer 8
-
$3,461 USD
View
Price last confirmed 8 days ago
A
Retailer 9
-
$3,464 USD
View
A
Retailer 10
-
$3,487 USD
View
A
Retailer 11
-
$3,697 USD
View
A
Retailer 12
-
$3,817 USD
View
A
Retailer 13
-
$4,098 USD
View
B+
Retailer 14
-
$5,599 USD
View
Most Expensive
B+
NZ Jewellers
ca66ec14-a278-4bb1-b408-71a51fcce9b5 · Nov 5
$5,850 USD
View
14 more retailers have this diamond
Prices start from $2,937 USDSave up to $2,913 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
1.51ct Marquise
$2,937 USD