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Round|Natural|GIA

1.51ct K SI2 Round Natural Diamond

EX • K/SI2 • GIA 6531904444

Certificate GIA 6531904444

Diamond specifications and retailer prices

From $3,601 AUD
As of November 6, 2026
Save $4,933 AUD (58%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $8,534 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 6531904444. Listed at 14 retailers as of November 5, 2026, with prices from $3,601 to $8,534, a $4,933 spread on the same certified stone. NZ Jewellers lists it at $8,534. 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
FluorescenceFaint
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6531904444
Dimensions7.28 × 7.24 × 4.56 mm
L/W Ratio1.01
Top View
7.28 mm7.24 mm1.51 ctK / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6531904444
Side View
Table 57.0%Crown 36°Girdle: Slightly ThickPavilion 40.6°Culet: NoneDepth 62.8%

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: $8,534 AUD|Low: $3,566 AUD|High: $8,534 AUD|Avg: $5,378 AUD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
November 6, 2026
Retailer 12$3,601 AUD
Retailer 10$3,636 AUD
Retailer 13$3,951 AUD
Retailer 5$4,348 AUD
Retailer 14$4,428 AUD
Retailer 6$4,575 AUD
Retailer 8$4,677 AUD
Retailer 4$4,898 AUD
Retailer 2$5,015 AUD
Retailer 3$5,087 AUD
Retailer 7$5,653 AUD
Retailer 9$5,690 AUD
Retailer 15$6,580 AUD
Retailer 11$8,192 AUD
NZ Jewellers$8,534 AUD

42 data points across 15 retailers

14 retailers$3,601 AUD to $8,534 AUD

A
Cheapest Retailer
-
$3,601 AUD
A
Retailer 2
-
$3,636 AUD
View
A
Retailer 3
-
$3,951 AUD
View
A
Retailer 4
-
$4,348 AUD
View
A
Retailer 5
-
$4,428 AUD
View
A
Retailer 6
-
$4,575 AUD
View
A
Retailer 7
-
$4,677 AUD
View
Retailer 8
-
$4,898 AUD
View
Price last confirmed 8 days ago
B+
Retailer 9
-
$5,015 AUD
View
B+
Retailer 10
-
$5,087 AUD
View
B+
Retailer 11
-
$5,653 AUD
View
B+
Retailer 12
-
$5,690 AUD
View
B
Retailer 13
-
$8,192 AUD
View
Most Expensive
B
NZ Jewellers
b756b306-6707-490a-93b1-43e155f92c84 · Nov 5
$8,534 AUD
$5,974 USD
View
13 more retailers have this diamond
Prices start from $3,601 AUDSave up to $4,933 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
$3,601 AUD