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Round|Natural|GIA

1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 5496366542

Certificate GIA 5496366542

Diamond specifications and retailer prices

From $5,095 AUD
As of November 4, 2026
Save $5,793 AUD (53%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $11,727 AUD at NZ Jewellers · As of October 20, 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 GIA 5496366542. Listed at 16 retailers as of November 4, 2026, with a 114% 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
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 5496366542
Dimensions7.36 × 7.39 × 4.48 mm
L/W Ratio1.00
Star length45%
Lower girdle75%
Top View
7.36 mm7.39 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5496366542
Side View
Table 59.0%Crown 34°Girdle: Slightly ThickPavilion 40.6°Culet: NoneDepth 60.7%

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 4
Current: $7,464 AUD|Low: $5,095 AUD|High: $10,917 AUD|Avg: $7,497 AUD|-0.5%
Retailer 1
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
November 6, 2026
Retailer 14$5,095 AUD
Retailer 12$5,464 AUD
Retailer 4$5,893 AUD
Retailer 2$6,210 AUD
Retailer 3$6,210 AUD
Retailer 7$6,705 AUD
Retailer 5$7,050 AUD
Retailer 6$7,165 AUD
Retailer 1$7,464 AUD
Retailer 13$7,568 AUD
Retailer 9$7,601 AUD
Retailer 10$7,705 AUD
Retailer 8$8,362 AUD
Retailer 11$10,888 AUD

36 data points across 14 retailers

16 retailers$5,095 AUD to $10,888 AUD

A
Cheapest Retailer
-
$5,095 AUD
A
Retailer 2
-
$5,464 AUD
View
B+
Retailer 3
-
$5,893 AUD
View
Retailer 4
-
$6,097 AUD
View
Price last confirmed 21 days ago
Retailer 5
-
$6,210 AUD
View
Price last confirmed 15 days ago
Retailer 6
-
$6,210 AUD
View
Price last confirmed 15 days ago
B+
Retailer 7
-
$6,705 AUD
View
B+
Retailer 8
-
$7,050 AUD
View
Retailer 9
-
$7,165 AUD
View
Price last confirmed 16 days ago
B+
Retailer 10
-
$7,464 AUD
View
Retailer 11
-
$7,568 AUD
View
Price last confirmed 14 days ago
B
Retailer 12
-
$7,601 AUD
View
B
Retailer 13
-
$7,705 AUD
View
B
Retailer 14
-
$8,362 AUD
View
B
Retailer 15
-
$10,888 AUD
View
Most Expensive
NZ Jewellers
9eac41b1-20e5-4cf4-ae86-a3e1d9d3065b · Oct 20
$11,727 AUD
$8,209 USD
View
Price last confirmed 16 days ago
15 more retailers have this diamond
Prices start from $5,095 AUDSave up to $5,793 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
$5,095 AUD