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Round|Natural|GIA

1.00ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 240

Certificate GIA 240

Diamond specifications and retailer prices

From $1,878 AUD
As of November 5, 2026
Save $2,704 AUD (59%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $4,945 AUD at NZ Jewellers · As of September 25, 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. Listed at 11 retailers as of November 5, 2026, with a 144% 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
OriginNatural
Grading LabGIA
CertificateGIA 240
Dimensions6.46 × 6.50 × 3.91 mm
L/W Ratio1.01
Top View
6.46 mm6.50 mm1.00 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 240
Side View
Table 59.0%CrownGirdle: THN-MEDPavilionCulet: NoneDepth 60.2%

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 5
Current: $4,583 AUD|Low: $1,878 AUD|High: $4,945 AUD|Avg: $2,573 AUD|-7.3%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 24, 2026
Retailer 2$1,878 AUD
Retailer 4$1,878 AUD
Retailer 5$1,920 AUD
Retailer 3$1,966 AUD
Retailer 6$2,168 AUD
Retailer 7$2,377 AUD
Retailer 8$2,436 AUD
Retailer 9$2,854 AUD
NZ Jewellers$4,583 AUD

18 data points across 9 retailers

11 retailers$1,878 AUD to $4,583 AUD

A
Cheapest Retailer
-
$1,878 AUD
Retailer 2
-
$1,878 AUD
View
Price last confirmed 8 days ago
A
Retailer 3
-
$1,920 AUD
View
A
Retailer 4
-
$1,966 AUD
View
Retailer 5
-
$2,027 AUD
View
Price last confirmed 43 days ago
A
Retailer 6
-
$2,168 AUD
View
Retailer 7
-
$2,340 AUD
View
Price last confirmed 45 days ago
Retailer 8
-
$2,377 AUD
View
Price last confirmed 30 days ago
Retailer 9
-
$2,436 AUD
View
Price last confirmed 30 days ago
B
Retailer 10
-
$4,583 AUD
View
Most Expensive
NZ Jewellers
cc9b158d-30ec-4b7a-8bf3-4d1f069758aa · Sep 25
$4,945 AUD
$3,462 USD
View
Price last confirmed 42 days ago
10 more retailers have this diamond
Prices start from $1,878 AUDSave up to $2,704 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
$1,878 AUD