CaratHunter
Plans
Marquise|Natural|IGI

0.51ct I SI1 Marquise Natural Diamond

EX • I/SI1 • IGI 839658603

Shape and cutting style on the report: Marquise brilliant

Certificate IGI 839658603

Diamond specifications and retailer prices

From $647 NZD
₹34,669 INR
As of October 31, 2026
Save $2,609 NZD (80%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $3,256 NZD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 0.51ct natural marquise diamond

This 0.51ct natural marquise sits in the half to three-quarter carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 839658603. Listed at 12 retailers as of October 30, 2026, with prices from $647 to $3,256, a $2,609 spread on the same certified stone. NZ Jewellers lists it at $3,256. 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

0.51
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.3°
Pavilion angle39.5°
OriginNatural
Grading LabIGI
CertificateIGI 839658603
Dimensions8.28 × 4.16 × 2.59 mm
L/W Ratio1.99
Girdle conditionFaceted
Top View
8.28 mm4.16 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 839658603
Side View
Table 60.0%Crown 37.3°Girdle: MED-STKPavilion 39.5°Culet: NoneDepth 62.3%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 31
Current: $3,256 NZD|Low: $645 NZD|High: $3,256 NZD|Avg: $1,194 NZD
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
October 31, 2026
Retailer 2$647 NZD
Retailer 3$782 NZD
Retailer 5$809 NZD
Retailer 13$850 NZD
Retailer 11$915 NZD
Retailer 4$981 NZD
Retailer 8$1,046 NZD
Retailer 12$1,104 NZD
Retailer 6$1,112 NZD
Retailer 7$1,183 NZD
Retailer 10$1,208 NZD
Retailer 9$1,964 NZD
NZ Jewellers$3,256 NZD

14 data points across 13 retailers

12 retailers$647 NZD to $3,256 NZD

A
Cheapest Retailer
-
$647 NZD
₹34,669 INR
Retailer 2
-
$809 NZD
$455 USD
View
Price last confirmed 15 days ago
A
Retailer 3
-
$850 NZD
$478 USD
View
A
Retailer 4
-
$915 NZD
$515 USD
View
A
Retailer 5
-
$981 NZD
$552 USD
View
A
Retailer 6
-
$1,046 NZD
£463 GBP
View
B+
Retailer 7
-
$1,104 NZD
$621 USD
View
B+
Retailer 8
-
$1,112 NZD
£493 GBP
View
B+
Retailer 9
-
$1,183 NZD
€634 EUR
View
B+
Retailer 10
-
$1,208 NZD
$680 USD
View
Retailer 11
-
$1,964 NZD
£870 GBP
View
Price last confirmed 7 days ago
Most Expensive
B
NZ Jewellers
8931b356-73f5-4507-8694-f0697f6376fd · Oct 30
$3,256 NZD
$1,832 USD
View
11 more retailers have this diamond
Prices start from $647 NZDSave up to $2,609 NZD

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
$647 NZD