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Round|Natural|IGI

1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • IGI 754512199

Shape and cutting style on the report: Round brilliant

Certificate IGI 754512199

Diamond specifications and retailer prices

From $3,068 AUD
As of November 6, 2026
Save $4,917 AUD (62%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $7,985 AUD at NZ Jewellers · As of November 5, 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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 754512199. Listed at 19 retailers as of November 5, 2026, with prices from $3,068 to $7,985, a $4,917 spread on the same certified stone. NZ Jewellers lists it at $7,985. 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
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.7°
Pavilion angle40.5°
OriginNatural
Grading LabIGI
CertificateIGI 754512199
Dimensions7.17 × 7.23 × 4.57 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.17 mm7.23 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 754512199
Side View
Table 56.0%Crown 36.7°Girdle: Slightly ThickPavilion 40.5°Culet: NoneDepth 63.5%

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: $3,068 AUD|Low: $3,068 AUD|High: $6,771 AUD|Avg: $4,196 AUD|-2.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 1$3,068 AUD
Retailer 9$3,286 AUD
Retailer 6$3,463 AUD
Retailer 2$3,764 AUD
Retailer 10$3,880 AUD
Retailer 3$4,090 AUD
Retailer 4$4,471 AUD
Retailer 5$4,661 AUD
Retailer 7$4,717 AUD
Retailer 8$6,674 AUD

33 data points across 10 retailers

19 retailers$3,068 AUD to $7,985 AUD

A
Cheapest Retailer
-
$3,068 AUD
A
Retailer 2
-
$3,286 AUD
View
A
Retailer 3
-
$3,420 AUD
View
A
Retailer 4
-
$3,463 AUD
View
B+
Retailer 5
-
$3,764 AUD
View
Retailer 6
-
$3,820 AUD
View
Price last confirmed 8 days ago
B+
Retailer 7
-
$3,820 AUD
View
A
Retailer 8
-
$3,880 AUD
View
B+
Retailer 9
-
$3,887 AUD
View
B+
Retailer 10
-
$3,967 AUD
View
B+
Retailer 11
-
$4,021 AUD
View
A
Retailer 12
-
$4,090 AUD
View
B+
Retailer 13
-
$4,407 AUD
View
A
Retailer 14
-
$4,471 AUD
View
A
Retailer 15
-
$4,661 AUD
View
A
Retailer 16
-
$4,717 AUD
View
B+
Retailer 17
-
$5,860 AUD
View
B+
Retailer 18
-
$6,674 AUD
View
Most Expensive
B
NZ Jewellers
506969c5-90e3-475c-97b0-c094ff3fa585 · Nov 5
$7,985 AUD
$5,590 USD
View
18 more retailers have this diamond
Prices start from $3,068 AUDSave up to $4,917 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
$3,068 AUD