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1.51ct K SI2 Round Natural Diamond

EX • K/SI2 • GIA 6491766711

Shape and cutting style on the report: Round brilliant

Certificate GIA 6491766711

Diamond specifications and retailer prices

From $6,547 AUD
As of November 4, 2026
Save $7,312 AUD (53%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $13,859 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 GIA 6491766711. Listed at 15 retailers as of November 4, 2026, with prices from $6,547 to $13,859, a $7,312 spread on the same certified stone. NZ Jewellers lists it at $13,859. 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 angle34.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6491766711
Dimensions7.34 × 7.31 × 4.56 mm
L/W Ratio1.00
Star length50%
Lower girdle75%
Top View
7.34 mm7.31 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6491766711
Side View
Table 56.0%Crown 34.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.2%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $9,007 AUD|Low: $6,547 AUD|High: $12,355 AUD|Avg: $8,418 AUD|-0.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 9$6,547 AUD
Retailer 5$6,627 AUD
Retailer 7$6,628 AUD
Retailer 8$6,988 AUD
Retailer 2$7,508 AUD
Retailer 3$7,951 AUD
Retailer 1$9,007 AUD
Retailer 6$9,024 AUD
Retailer 10$11,131 AUD
Retailer 4$12,177 AUD

43 data points across 10 retailers

15 retailers$6,547 AUD to $13,859 AUD

B+
Cheapest Retailer
-
$6,547 AUD
B+
Retailer 2
-
$6,627 AUD
View
B+
Retailer 3
-
$6,628 AUD
View
B+
Retailer 4
-
$6,988 AUD
View
B
Retailer 5
-
$7,428 AUD
View
Retailer 6
-
$7,508 AUD
View
Price last confirmed 8 days ago
B
Retailer 7
-
$7,508 AUD
View
B
Retailer 8
-
$7,508 AUD
View
B+
Retailer 9
-
$7,951 AUD
View
B
Retailer 10
-
$8,662 AUD
View
B
Retailer 11
-
$9,007 AUD
View
B
Retailer 12
-
$9,024 AUD
View
Retailer 13
-
$9,141 AUD
View
Price last confirmed 14 days ago
B
Retailer 14
-
$12,177 AUD
View
Most Expensive
B
NZ Jewellers
2ebd30b8-ea8c-4b5d-85d4-042f8b38b488 · Nov 5
$13,859 AUD
$9,702 USD
View
14 more retailers have this diamond
Prices start from $6,547 AUDSave up to $7,312 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.

B+
1.51ct Round
$6,547 AUD