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Round|Natural|IGI

1.51ct J SI2 Round Natural Diamond

EX • J/SI2 • IGI 635477890

Shape and cutting style on the report: Round brilliant

Certificate IGI 635477890

Diamond specifications and retailer prices

From $2,566 AUD
As of November 6, 2026
Save $3,110 AUD (55%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $6,793 AUD at NZ Jewellers · As of September 19, 2026
View at NZ Jewellers

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded J colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI 635477890. Listed at 14 retailers as of November 4, 2026, with a 121% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
J
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle40.8°
OriginNatural
Grading LabIGI
CertificateIGI 635477890
Dimensions7.35 × 7.32 × 4.53 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Top View
7.35 mm7.32 mm1.51 ctJ / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 635477890
Side View
Table 56.0%Crown 33°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.8%

Caratlytics Score

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

Price History

Last verified: Nov 6
Current: $2,566 AUD|Low: $2,566 AUD|High: $5,753 AUD|Avg: $3,806 AUD|-2.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 1$2,566 AUD
Retailer 6$2,934 AUD
Retailer 3$3,727 AUD
Retailer 5$4,044 AUD
Retailer 2$4,181 AUD
Retailer 4$5,675 AUD

38 data points across 6 retailers

14 retailers$2,566 AUD to $5,675 AUD

A
Cheapest Retailer
-
$2,566 AUD
A
Retailer 2
-
$2,934 AUD
View
A
Retailer 3
-
$3,101 AUD
View
Retailer 4
-
$3,250 AUD
View
Price last confirmed 50 days ago
Retailer 5
-
$3,250 AUD
View
Price last confirmed 29 days ago
Retailer 6
-
$3,250 AUD
View
Price last confirmed 29 days ago
Retailer 7
-
$3,400 AUD
View
Price last confirmed 38 days ago
A
Retailer 8
-
$3,447 AUD
View
A
Retailer 9
-
$3,727 AUD
View
Retailer 10
-
$3,748 AUD
View
Price last confirmed 45 days ago
A
Retailer 11
-
$4,044 AUD
View
A
Retailer 12
-
$4,181 AUD
View
B+
Retailer 13
-
$5,675 AUD
View
Most Expensive
NZ Jewellers
d875dae5-36b3-424d-92ca-e1c644a90494 · Sep 19
$6,793 AUD
$4,755 USD
View
Price last confirmed 47 days ago
13 more retailers have this diamond
Prices start from $2,566 AUDSave up to $3,110 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
1.51ct Round
$2,566 AUD