CaratHunter
Plans
Round|Natural|IGI

1.51ct K SI2 Round Natural Diamond

EX • K/SI2 • IGI 717555550

Shape and cutting style on the report: Round brilliant

Certificate IGI 717555550

Diamond specifications and retailer prices

From $1,520 AUD
As of November 6, 2026
Save $1,890 AUD (55%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $4,554 AUD at NZ Jewellers · As of September 28, 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 717555550. Listed at 11 retailers as of November 4, 2026, with a 124% 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
K
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.4°
Pavilion angle40.7°
OriginNatural
Grading LabIGI
CertificateIGI 717555550
Dimensions7.27 × 7.22 × 4.60 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.27 mm7.22 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 717555550
Side View
Table 56.0%Crown 36.4°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 63.5%

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: Nov 6
Current: $1,520 AUD|Low: $1,520 AUD|High: $3,461 AUD|Avg: $2,196 AUD|-1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 1$1,520 AUD
Retailer 4$1,730 AUD
Retailer 6$1,867 AUD
Retailer 5$2,060 AUD
Retailer 2$2,464 AUD
Retailer 3$3,410 AUD

42 data points across 6 retailers

11 retailers$1,520 AUD to $3,410 AUD

A
Cheapest Retailer
-
$1,520 AUD
A
Retailer 2
-
$1,730 AUD
View
Retailer 3
-
$1,867 AUD
View
Price last confirmed 39 days ago
Retailer 4
-
$1,867 AUD
View
Price last confirmed 25 days ago
Retailer 5
-
$1,867 AUD
View
Price last confirmed 29 days ago
Retailer 6
-
$1,953 AUD
View
Price last confirmed 38 days ago
A
Retailer 7
-
$2,060 AUD
View
Retailer 8
-
$2,154 AUD
View
Price last confirmed 38 days ago
A
Retailer 9
-
$2,464 AUD
View
A
Retailer 10
-
$3,410 AUD
View
Most Expensive
NZ Jewellers
593dcbd2-02db-43f1-9a03-0e5bf40204e8 · Sep 28
$4,554 AUD
$3,188 USD
View
Price last confirmed 39 days ago
10 more retailers have this diamond
Prices start from $1,520 AUDSave up to $1,890 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
$1,520 AUD