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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 $364 USD
₹34,669 INR
As of October 31, 2026
Save $1,468 USD (80%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,832 USD 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 $364 to $1,832, a $1,468 spread on the same certified stone. NZ Jewellers lists it at $1,832. 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
Color
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: $1,832 USD|Low: $363 USD|High: $1,832 USD|Avg: $672 USD
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$364 USD
Retailer 3$440 USD
Retailer 5$455 USD
Retailer 13$478 USD
Retailer 11$515 USD
Retailer 4$552 USD
Retailer 8$589 USD
Retailer 12$621 USD
Retailer 6$626 USD
Retailer 7$666 USD
Retailer 10$680 USD
Retailer 9$1,105 USD
NZ Jewellers$1,832 USD

14 data points across 13 retailers

12 retailers$364 USD to $1,832 USD

A
Cheapest Retailer
-
$364 USD
₹34,669 INR
Retailer 2
-
$455 USD
View
Price last confirmed 15 days ago
A
Retailer 3
-
$478 USD
View
A
Retailer 4
-
$515 USD
View
A
Retailer 5
-
$552 USD
View
A
Retailer 6
-
$589 USD
£463 GBP
View
B+
Retailer 7
-
$621 USD
View
B+
Retailer 8
-
$626 USD
£493 GBP
View
B+
Retailer 9
-
$666 USD
€634 EUR
View
B+
Retailer 10
-
$680 USD
View
Retailer 11
-
$1,105 USD
£870 GBP
View
Price last confirmed 7 days ago
Most Expensive
B
NZ Jewellers
8931b356-73f5-4507-8694-f0697f6376fd · Oct 30
$1,832 USD
View
11 more retailers have this diamond
Prices start from $364 USDSave up to $1,468 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
$364 USD