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Round|Natural|GIA

1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6491354443

Certificate GIA 6491354443

Diamond specifications and retailer prices

From $3,254 AUD
As of November 6, 2026
Save $4,046 AUD (55%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $7,625 AUD at NZ Jewellers · As of September 19, 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 6491354443. Listed at 16 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
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle34.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6491354443
Dimensions7.37 × 7.32 × 4.50 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
7.37 mm7.32 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6491354443
Side View
Table 60.0%Crown 34.5°Girdle: ThickPavilion 40.8°Culet: NoneDepth 61.2%

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: $4,537 AUD|Low: $3,144 AUD|High: $7,407 AUD|Avg: $4,582 AUD
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
November 6, 2026
Retailer 11$3,254 AUD
Retailer 2$3,920 AUD
Retailer 3$3,921 AUD
Retailer 10$3,950 AUD
Retailer 13$4,036 AUD
Retailer 12$4,303 AUD
Retailer 4$4,377 AUD
Retailer 6$4,495 AUD
Retailer 1$4,537 AUD
Retailer 5$4,581 AUD
Retailer 7$5,084 AUD
Retailer 8$5,343 AUD
Retailer 9$7,300 AUD

43 data points across 13 retailers

16 retailers$3,254 AUD to $7,300 AUD

A
Cheapest Retailer
-
$3,254 AUD
A
Retailer 2
-
$3,920 AUD
View
A
Retailer 3
-
$3,921 AUD
View
A
Retailer 4
-
$3,950 AUD
View
A
Retailer 5
-
$4,036 AUD
View
A
Retailer 6
-
$4,303 AUD
View
Retailer 7
-
$4,377 AUD
View
Price last confirmed 49 days ago
Retailer 8
-
$4,377 AUD
View
Price last confirmed 25 days ago
A
Retailer 9
-
$4,495 AUD
View
A
Retailer 10
-
$4,537 AUD
View
A
Retailer 11
-
$4,581 AUD
View
Retailer 12
-
$5,050 AUD
View
Price last confirmed 48 days ago
A
Retailer 13
-
$5,084 AUD
View
B+
Retailer 14
-
$5,343 AUD
View
B
Retailer 15
-
$7,300 AUD
View
Most Expensive
NZ Jewellers
665bc02b-f100-4dc7-8719-186e063fbfef · Sep 19
$7,625 AUD
$5,338 USD
View
Price last confirmed 48 days ago
15 more retailers have this diamond
Prices start from $3,254 AUDSave up to $4,046 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
$3,254 AUD