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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 $1,302 USD
As of November 4, 2026
Save $2,123 USD (62%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $3,425 USD 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 $1,302 to $3,425, a $2,123 spread on the same certified stone. NZ Jewellers lists it at $3,425. 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
Color
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: $3,425 USD|Low: $1,302 USD|High: $3,617 USD|Avg: $1,865 USD|-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$1,302 USD
Retailer 2$1,325 USD
Retailer 11$1,404 USD
Retailer 4$1,444 USD
Retailer 12$1,469 USD
Retailer 3$1,502 USD
Retailer 10$1,539 USD
Retailer 13$1,620 USD
Retailer 7$1,813 USD
Retailer 14$1,902 USD
Retailer 6$1,955 USD
Retailer 5$2,268 USD
Retailer 9$2,565 USD
NZ Jewellers$3,425 USD

32 data points across 14 retailers

16 retailers$1,302 USD to $3,425 USD

A
Cheapest Retailer
-
$1,302 USD
A
Retailer 2
-
$1,325 USD
View
A
Retailer 3
-
$1,404 USD
View
Retailer 4
-
$1,444 USD
View
Price last confirmed 8 days ago
A
Retailer 5
-
$1,469 USD
View
A
Retailer 6
-
$1,502 USD
View
A
Retailer 7
-
$1,507 USD
View
A
Retailer 8
-
$1,539 USD
View
A
Retailer 9
-
$1,620 USD
View
A
Retailer 10
-
$1,813 USD
View
A
Retailer 11
-
$1,865 USD
View
Retailer 12
-
$1,902 USD
View
Price last confirmed 16 days ago
Retailer 13
-
$1,955 USD
View
Price last confirmed 33 days ago
Retailer 14
-
$2,268 USD
View
Price last confirmed 15 days ago
B+
Retailer 15
-
$2,565 USD
View
Most Expensive
B+
NZ Jewellers
688d6296-1ba7-4585-9024-79ef1b351d01 · Nov 5
$3,425 USD
View
15 more retailers have this diamond
Prices start from $1,302 USDSave up to $2,123 USD

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
$1,302 USD