CaratHunter
Plans
Round|Natural|IGI

1.51ct K SI2 Round Natural Diamond

EX • K/SI2 • IGI 648418562

Shape and cutting style on the report: Round brilliant

Certificate IGI 648418562

Diamond specifications and retailer prices

From $2,774 AUD
As of November 6, 2026
Save $5,361 AUD (66%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $8,135 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI 648418562. Listed at 13 retailers as of November 5, 2026, with prices from $2,774 to $8,135, a $5,361 spread on the same certified stone. NZ Jewellers lists it at $8,135. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle40.8°
OriginNatural
Grading LabIGI
CertificateIGI 648418562
Dimensions7.47 × 7.42 × 4.46 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
7.47 mm7.42 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 648418562
Side View
Table 58.0%Crown 33.4°Girdle: MediumPavilion 40.8°Culet: NoneDepth 60.0%

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: $2,774 AUD|Low: $2,774 AUD|High: $6,898 AUD|Avg: $4,214 AUD|-2.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 1$2,774 AUD
Retailer 6$3,484 AUD
Retailer 5$3,538 AUD
Retailer 7$3,550 AUD
Retailer 3$4,271 AUD
Retailer 2$5,135 AUD
Retailer 4$6,798 AUD

38 data points across 7 retailers

13 retailers$2,774 AUD to $8,135 AUD

A
Cheapest Retailer
-
$2,774 AUD
B+
Retailer 2
-
$3,484 AUD
View
A
Retailer 3
-
$3,538 AUD
View
B+
Retailer 4
-
$3,550 AUD
View
B+
Retailer 5
-
$3,891 AUD
View
Retailer 6
-
$3,891 AUD
View
Price last confirmed 8 days ago
B+
Retailer 7
-
$4,041 AUD
View
B+
Retailer 8
-
$4,093 AUD
View
A
Retailer 9
-
$4,271 AUD
View
B+
Retailer 10
-
$4,490 AUD
View
B+
Retailer 11
-
$5,135 AUD
View
B+
Retailer 12
-
$6,798 AUD
View
Most Expensive
B
NZ Jewellers
16172003-4e4c-4cee-b131-80db80be7fc9 · Nov 5
$8,135 AUD
$5,695 USD
View
12 more retailers have this diamond
Prices start from $2,774 AUDSave up to $5,361 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
$2,774 AUD