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0.51ct I SI2 Round Natural Diamond

EX • I/SI2 • IGI 841685200

Shape and cutting style on the report: Round brilliant

Certificate IGI 841685200

Diamond specifications and retailer prices

From $397 AUD
As of November 6, 2026
Save $1,708 AUD (81%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $2,106 AUD at NZ Jewellers · As of November 4, 2026
View at NZ Jewellers

About this 0.51ct natural round diamond

This 0.51ct natural round sits in the half to three-quarter carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI 841685200. Listed at 12 retailers as of November 4, 2026, with prices from $397 to $2,106, a $1,708 spread on the same certified stone. NZ Jewellers lists it at $2,106. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.7°
Pavilion angle40.3°
OriginNatural
Grading LabIGI
CertificateIGI 841685200
Dimensions5.11 × 5.19 × 3.09 mm
L/W Ratio1.02
Girdle conditionFaceted
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
5.11 mm5.19 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 841685200
Side View
Table 59.0%Crown 34.7°Girdle: MED-STKPavilion 40.3°Culet: NoneDepth 60.2%

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: Nov 6
Current: $2,106 AUD|Low: $397 AUD|High: $2,106 AUD|Avg: $788 AUD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 2$397 AUD
Retailer 3$506 AUD
Retailer 12$550 AUD
Retailer 8$564 AUD
Retailer 11$613 AUD
Retailer 5$651 AUD
Retailer 7$726 AUD
Retailer 10$740 AUD
Retailer 4$836 AUD
Retailer 6$890 AUD
Retailer 9$1,266 AUD
NZ Jewellers$2,106 AUD

21 data points across 12 retailers

12 retailers$397 AUD to $2,106 AUD

A
Cheapest Retailer
-
$397 AUD
A
Retailer 2
-
$506 AUD
View
Final sale: no returns
A
Retailer 3
-
$550 AUD
View
A
Retailer 4
-
$564 AUD
View
A
Retailer 5
-
$613 AUD
View
A
Retailer 6
-
$651 AUD
View
A
Retailer 7
-
$726 AUD
View
A
Retailer 8
-
$740 AUD
View
B+
Retailer 9
-
$836 AUD
View
A
Retailer 10
-
$890 AUD
View
B
Retailer 11
-
$1,266 AUD
View
Most Expensive
C
NZ Jewellers
b667473d-a753-4bb3-887c-c678a9e7309a · Nov 4
$2,106 AUD
$1,474 USD
View
11 more retailers have this diamond
Prices start from $397 AUDSave up to $1,708 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 Round
$397 AUD