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Round|Natural|GIA

1.00ct I SI2 Round Natural Diamond

ID • I/SI2 • GIA 1223

Certificate GIA 1223

Diamond specifications and retailer prices

From $1,860 AUD
As of November 4, 2026
Save $3,033 AUD (62%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $4,893 AUD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 16 retailers as of November 4, 2026, with prices from $1,860 to $4,893, a $3,033 spread on the same certified stone. NZ Jewellers lists it at $4,893. 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
I
Colour
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 1223
Dimensions6.44 × 6.48 × 3.92 mm
L/W Ratio1.01
Top View
6.44 mm6.48 mm1.00 ctI / SI2
OriginNatural
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1223
Side View
Table 59.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 60.8%

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 4
Current: $4,893 AUD|Low: $1,860 AUD|High: $5,167 AUD|Avg: $2,664 AUD|-5.3%
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
Retailer 14
November 6, 2026
Retailer 8$1,860 AUD
Retailer 2$1,893 AUD
Retailer 11$2,006 AUD
Retailer 4$2,063 AUD
Retailer 12$2,098 AUD
Retailer 3$2,146 AUD
Retailer 10$2,198 AUD
Retailer 13$2,314 AUD
Retailer 7$2,590 AUD
Retailer 14$2,717 AUD
Retailer 6$2,793 AUD
Retailer 5$3,240 AUD
Retailer 9$3,664 AUD
NZ Jewellers$4,893 AUD

32 data points across 14 retailers

16 retailers$1,860 AUD to $4,893 AUD

A
Cheapest Retailer
-
$1,860 AUD
A
Retailer 2
-
$1,893 AUD
View
A
Retailer 3
-
$2,006 AUD
View
Retailer 4
-
$2,063 AUD
View
Price last confirmed 8 days ago
A
Retailer 5
-
$2,098 AUD
View
A
Retailer 6
-
$2,146 AUD
View
A
Retailer 7
-
$2,153 AUD
View
A
Retailer 8
-
$2,198 AUD
View
A
Retailer 9
-
$2,314 AUD
View
A
Retailer 10
-
$2,590 AUD
View
A
Retailer 11
-
$2,664 AUD
View
Retailer 12
-
$2,717 AUD
View
Price last confirmed 16 days ago
Retailer 13
-
$2,793 AUD
View
Price last confirmed 33 days ago
Retailer 14
-
$3,240 AUD
View
Price last confirmed 15 days ago
B+
Retailer 15
-
$3,664 AUD
View
Most Expensive
B+
NZ Jewellers
688d6296-1ba7-4585-9024-79ef1b351d01 · Nov 5
$4,893 AUD
$3,425 USD
View
15 more retailers have this diamond
Prices start from $1,860 AUDSave up to $3,033 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
$1,860 AUD