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Round|Natural|IGI

1.50ct M SI1 Round Natural Diamond

EX • M/SI1 • IGI 550250291

Shape and cutting style on the report: Round brilliant

Certificate IGI 550250291

Diamond specifications and retailer prices

From $2,183 AUD
As of November 5, 2026
Save $4,553 AUD (68%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $6,735 AUD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.5ct natural round diamond

This 1.5ct natural round sits in the one-and-a-half to two carat band, graded M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 550250291. Listed at 13 retailers as of November 5, 2026, with prices from $2,183 to $6,735, a $4,553 spread on the same certified stone. NZ Jewellers lists it at $6,735. 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

1.50
Carat
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.4°
Pavilion angle40.1°
OriginNatural
Grading LabIGI
CertificateIGI 550250291
Dimensions7.39 × 7.43 × 4.36 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.39 mm7.43 mm1.50 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 550250291
Side View
Table 61.5%Crown 32.4°Girdle: MED-STKPavilion 40.1°Culet: NoneDepth 58.7%

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 5
Current: $3,007 AUD|Low: $2,183 AUD|High: $3,783 AUD|Avg: $2,913 AUD|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 2$2,183 AUD
Retailer 5$2,496 AUD
Retailer 7$2,761 AUD
Retailer 6$2,821 AUD
Retailer 1$3,007 AUD
Retailer 3$3,370 AUD
Retailer 4$3,747 AUD

39 data points across 7 retailers

13 retailers$2,183 AUD to $6,735 AUD

A
Cheapest Retailer
-
$2,183 AUD
B+
Retailer 2
-
$2,496 AUD
View
B+
Retailer 3
-
$2,691 AUD
View
B+
Retailer 4
-
$2,761 AUD
View
Retailer 5
-
$2,761 AUD
View
Price last confirmed 8 days ago
B+
Retailer 6
-
$2,821 AUD
View
B+
Retailer 7
-
$2,890 AUD
View
B+
Retailer 8
-
$2,958 AUD
View
A
Retailer 9
-
$3,007 AUD
View
B+
Retailer 10
-
$3,187 AUD
View
B+
Retailer 11
-
$3,370 AUD
View
B+
Retailer 12
-
$3,747 AUD
View
Most Expensive
B
NZ Jewellers
8beecb8e-053c-42f6-8142-5f90efbb540c · Nov 5
$6,735 AUD
$4,715 USD
View
12 more retailers have this diamond
Prices start from $2,183 AUDSave up to $4,553 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
1.50ct Round
$2,183 AUD