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Round|Natural|IGI

2.50ct J SI1 Round Natural Diamond

EX • J/SI1 • IGI 670478879

Shape and cutting style on the report: Round brilliant

Certificate IGI 670478879

Diamond specifications and retailer prices

From $17,324 AUD
$12,169 USD
As of October 30, 2026
Save $10,871 AUD (39%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $28,194 AUD at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 2.5ct natural round diamond

This 2.5ct natural round sits in the two to three carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 670478879. Listed at 13 retailers as of October 30, 2026, with prices from $17,324 to $28,194, a $10,871 spread on the same certified stone. NZ Jewellers lists it at $28,194. 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

2.50
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle41.5°
OriginNatural
Grading LabIGI
CertificateIGI 670478879
Dimensions8.64 × 8.72 × 5.34 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
8.64 mm8.72 mm2.50 ctJ / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 670478879
Side View
Table 60.0%Crown 34.1°Girdle: MED-STKPavilion 41.5°Culet: NoneDepth 61.5%

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 30
Current: $23,391 AUD|Low: $15,561 AUD|High: $26,382 AUD|Avg: $19,961 AUD|+3.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 31, 2026
Retailer 3$17,106 AUD
Retailer 2$17,324 AUD
Retailer 7$17,895 AUD
Retailer 4$18,436 AUD
Retailer 9$18,673 AUD
Retailer 8$19,918 AUD
Retailer 11$20,229 AUD
Retailer 10$21,007 AUD
Retailer 5$21,317 AUD
Retailer 1$23,391 AUD
Retailer 6$26,207 AUD

40 data points across 11 retailers

13 retailers$17,324 AUD to $28,194 AUD

A
Cheapest Retailer
-
$17,324 AUD
$12,169 USD
B+
Retailer 2
-
$17,895 AUD
$12,570 USD
View
Final sale: no returns
B+
Retailer 3
-
$18,357 AUD
$12,895 USD
View
A
Retailer 4
-
$18,436 AUD
£10,197 GBP
View
B+
Retailer 5
-
$18,673 AUD
$13,117 USD
View
B+
Retailer 6
-
$19,918 AUD
$13,991 USD
View
B+
Retailer 7
-
$20,229 AUD
$14,210 USD
View
B+
Retailer 8
-
$20,728 AUD
$14,560 USD
View
B+
Retailer 9
-
$21,007 AUD
$14,756 USD
View
B+
Retailer 10
-
$21,317 AUD
€14,261 EUR
View
B+
Retailer 11
-
$23,391 AUD
ZAR 265,446 ZAR
View
B
Retailer 12
-
$26,207 AUD
£14,495 GBP
View
Most Expensive
B
NZ Jewellers
d4324a38-5c97-4e14-9532-3d9ceabba2dd · Oct 30
$28,194 AUD
$19,805 USD
View
12 more retailers have this diamond
Prices start from $17,324 AUDSave up to $10,871 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
2.50ct Round
$17,324 AUD