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Round|Natural|GIA

1.30ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 1553137824

Certificate GIA 1553137824

Diamond specifications and retailer prices

From $2,651 AUD
As of November 6, 2026
Save $3,517 AUD (57%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $7,412 AUD at NZ Jewellers · As of October 23, 2026
View at NZ Jewellers

About this 1.3ct natural round diamond

This 1.3ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1553137824. Listed at 13 retailers as of November 4, 2026, with a 133% 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

1.30
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 1553137824
Dimensions6.87 × 6.94 × 4.32 mm
L/W Ratio1.01
Girdle conditionFaceted
Top View
6.87 mm6.94 mm1.30 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1553137824
Side View
Table 58.0%Crown 36°Girdle: Slightly ThickPavilion 40.8°Culet: NoneDepth 62.5%

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: $7,412 AUD|Low: $2,633 AUD|High: $7,515 AUD|Avg: $4,216 AUD|-1.4%
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
November 6, 2026
Retailer 3$2,651 AUD
Retailer 12$3,236 AUD
Retailer 8$3,243 AUD
Retailer 5$3,257 AUD
Retailer 2$3,361 AUD
Retailer 6$3,690 AUD
Retailer 4$3,693 AUD
Retailer 7$3,696 AUD
Retailer 10$4,288 AUD
Retailer 9$4,355 AUD
Retailer 13$5,403 AUD
Retailer 11$6,168 AUD
NZ Jewellers$7,412 AUD

30 data points across 13 retailers

13 retailers$2,651 AUD to $6,168 AUD

A
Cheapest Retailer
-
$2,651 AUD
A
Retailer 2
-
$3,236 AUD
View
A
Retailer 3
-
$3,243 AUD
View
Final sale: no returns
A
Retailer 4
-
$3,257 AUD
View
A
Retailer 5
-
$3,361 AUD
View
A
Retailer 6
-
$3,690 AUD
View
A
Retailer 7
-
$3,693 AUD
View
A
Retailer 8
-
$3,696 AUD
View
B+
Retailer 9
-
$4,288 AUD
View
B+
Retailer 10
-
$4,355 AUD
View
B+
Retailer 11
-
$5,403 AUD
View
B
Retailer 12
-
$6,168 AUD
View
Most Expensive
NZ Jewellers
18fc6ffb-5f84-40f0-8655-db590685a699 · Oct 23
$7,412 AUD
$5,189 USD
View
Price last confirmed 13 days ago
12 more retailers have this diamond
Prices start from $2,651 AUDSave up to $3,517 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
1.30ct Round
$2,651 AUD