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Round|Natural|GIA

1.51ct K SI2 Round Natural Diamond

VG • K/SI2 • GIA 2557668439

Certificate GIA 2557668439

Diamond specifications and retailer prices

From $2,980 AUD
As of November 4, 2026
Save $3,868 AUD (56%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $8,440 AUD at NZ Jewellers · As of September 26, 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 very-good cut grade and certified by GIA 2557668439. Listed at 15 retailers as of November 4, 2026, with a 130% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
K
Colour
SI2
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle38°
Pavilion angle40.4°
OriginNatural
Grading LabGIA
CertificateGIA 2557668439
Dimensions7.08 × 7.16 × 4.59 mm
L/W Ratio1.01
Girdle conditionFaceted
Top View
7.08 mm7.16 mm1.51 ctK / SI2
OriginNatural
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 2557668439
Side View
Table 58.0%Crown 38°Girdle: STK-THKPavilion 40.4°Culet: NoneDepth 64.4%

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: $4,573 AUD|Low: $2,907 AUD|High: $7,158 AUD|Avg: $4,013 AUD|-1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 5, 2026
Retailer 4$2,980 AUD
Retailer 6$3,208 AUD
Retailer 9$3,227 AUD
Retailer 7$3,274 AUD
Retailer 5$3,278 AUD
Retailer 8$3,844 AUD
Retailer 2$4,123 AUD
Retailer 1$4,573 AUD
Retailer 3$6,848 AUD

43 data points across 9 retailers

15 retailers$2,980 AUD to $6,848 AUD

A
Cheapest Retailer
-
$2,980 AUD
A
Retailer 2
-
$3,208 AUD
View
A
Retailer 3
-
$3,227 AUD
View
A
Retailer 4
-
$3,274 AUD
View
B+
Retailer 5
-
$3,278 AUD
View
Final sale: no returns
Retailer 6
-
$3,657 AUD
View
Price last confirmed 25 days ago
Retailer 7
-
$3,657 AUD
View
Price last confirmed 29 days ago
Retailer 8
-
$3,826 AUD
View
Price last confirmed 38 days ago
B+
Retailer 9
-
$3,844 AUD
View
A
Retailer 10
-
$4,123 AUD
View
Retailer 11
-
$4,220 AUD
View
Price last confirmed 28 days ago
B+
Retailer 12
-
$4,573 AUD
View
Retailer 13
-
$4,848 AUD
View
Price last confirmed 45 days ago
B
Retailer 14
-
$6,848 AUD
View
Most Expensive
NZ Jewellers
f89b9305-cc72-4e1f-9aaa-ed09125b63e3 · Sep 26
$8,440 AUD
$5,908 USD
View
Price last confirmed 40 days ago
14 more retailers have this diamond
Prices start from $2,980 AUDSave up to $3,868 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
$2,980 AUD