CaratHunter
Plans
Round|Natural|GIA

1.00ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 2558715221

Certificate GIA 2558715221

Diamond specifications and retailer prices

From $2,194 AUD
As of November 6, 2026
Save $2,927 AUD (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $6,128 AUD at NZ Jewellers · As of October 3, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2558715221. Listed at 20 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

1.00
Carat
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.5°
Pavilion angle41.8°
OriginNatural
Grading LabGIA
CertificateGIA 2558715221
Dimensions6.40 × 6.46 × 3.93 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather
Top View
6.40 mm6.46 mm1.00 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2558715221
Side View
Table 61.0%Crown 33.5°Girdle: MED-STKPavilion 41.8°Culet: NoneDepth 61.1%

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: $2,287 AUD|Low: $2,194 AUD|High: $5,197 AUD|Avg: $3,341 AUD|-3.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 7$2,194 AUD
Retailer 1$2,287 AUD
Retailer 5$2,701 AUD
Retailer 8$2,804 AUD
Retailer 2$3,166 AUD
Retailer 4$3,577 AUD
Retailer 3$3,973 AUD
Retailer 6$5,121 AUD

35 data points across 8 retailers

20 retailers$2,194 AUD to $5,121 AUD

A
Cheapest Retailer
-
$2,194 AUD
A
Retailer 2
-
$2,287 AUD
View
B+
Retailer 3
-
$2,701 AUD
View
B+
Retailer 4
-
$2,744 AUD
View
B+
Retailer 5
-
$2,750 AUD
View
B+
Retailer 6
-
$2,804 AUD
View
B+
Retailer 7
-
$2,928 AUD
View
Retailer 8
-
$2,931 AUD
View
Price last confirmed 39 days ago
Retailer 9
-
$2,931 AUD
View
Price last confirmed 28 days ago
Retailer 10
-
$2,931 AUD
View
Price last confirmed 25 days ago
B+
Retailer 11
-
$3,054 AUD
View
Retailer 12
-
$3,067 AUD
View
Price last confirmed 38 days ago
B+
Retailer 13
-
$3,128 AUD
View
B+
Retailer 14
-
$3,166 AUD
View
Retailer 15
-
$3,383 AUD
View
Price last confirmed 38 days ago
B+
Retailer 16
-
$3,577 AUD
View
B
Retailer 17
-
$3,973 AUD
View
B
Retailer 18
-
$5,121 AUD
View
Retailer 19
-
$6,128 AUD
View
Price last confirmed 39 days ago
Most Expensive
NZ Jewellers
7368ce97-3a06-415c-8add-e03809881242 · Oct 3
$6,128 AUD
$4,290 USD
View
Price last confirmed 34 days ago
19 more retailers have this diamond
Prices start from $2,194 AUDSave up to $2,927 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
1.00ct Round
$2,194 AUD