CaratHunter
Plans
Round|Natural|IGI

0.51ct I SI2 Round Natural Diamond

EX • I/SI2 • IGI 670417121

Shape and cutting style on the report: Round brilliant

Certificate IGI 670417121

Diamond specifications and retailer prices

From $377 AUD
As of November 6, 2026
Save $1,630 AUD (81%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $2,007 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 670417121. Listed at 12 retailers as of November 4, 2026, with prices from $377 to $2,007, a $1,630 spread on the same certified stone. NZ Jewellers lists it at $2,007. 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 angle35.6°
Pavilion angle41°
OriginNatural
Grading LabIGI
CertificateIGI 670417121
Dimensions5.10 × 5.05 × 3.18 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
5.10 mm5.05 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 670417121
Side View
Table 57.0%Crown 35.6°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.7%

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: $377 AUD|Low: $377 AUD|High: $1,223 AUD|Avg: $694 AUD|-1.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 1$377 AUD
Retailer 5$482 AUD
Retailer 3$538 AUD
Retailer 6$566 AUD
Retailer 7$739 AUD
Retailer 2$851 AUD
Retailer 4$1,208 AUD

44 data points across 7 retailers

12 retailers$377 AUD to $2,007 AUD

A
Cheapest Retailer
-
$377 AUD
A
Retailer 2
-
$482 AUD
View
Final sale: no returns
A
Retailer 3
-
$524 AUD
View
A
Retailer 4
-
$538 AUD
View
Retailer 5
-
$565 AUD
View
Price last confirmed 8 days ago
A
Retailer 6
-
$584 AUD
View
A
Retailer 7
-
$704 AUD
View
A
Retailer 8
-
$713 AUD
View
A
Retailer 9
-
$739 AUD
View
A
Retailer 10
-
$851 AUD
View
B+
Retailer 11
-
$1,208 AUD
View
Most Expensive
B
NZ Jewellers
027d91a0-08be-4dfe-9965-8ccb7e7514a0 · Nov 4
$2,007 AUD
$1,379 USD
View
11 more retailers have this diamond
Prices start from $377 AUDSave up to $1,630 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
$377 AUD