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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 $1,663 SGD
As of November 4, 2026
Save $2,712 SGD (62%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: $4,375 SGD 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 $1,663 to $4,375, a $2,712 spread on the same certified stone. NZ Jewellers lists it at $4,375. 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: $4,375 SGD|Low: $1,663 SGD|High: $4,620 SGD|Avg: $2,382 SGD|-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$1,663 SGD
Retailer 2$1,692 SGD
Retailer 11$1,793 SGD
Retailer 4$1,844 SGD
Retailer 12$1,876 SGD
Retailer 3$1,919 SGD
Retailer 10$1,966 SGD
Retailer 13$2,069 SGD
Retailer 7$2,316 SGD
Retailer 14$2,429 SGD
Retailer 6$2,497 SGD
Retailer 5$2,897 SGD
Retailer 9$3,276 SGD
NZ Jewellers$4,375 SGD

32 data points across 14 retailers

16 retailers$1,663 SGD to $4,375 SGD

A
Cheapest Retailer
-
$1,663 SGD
A
Retailer 2
-
$1,692 SGD
View
A
Retailer 3
-
$1,793 SGD
View
Retailer 4
-
$1,844 SGD
View
Price last confirmed 8 days ago
A
Retailer 5
-
$1,876 SGD
View
A
Retailer 6
-
$1,919 SGD
View
A
Retailer 7
-
$1,925 SGD
View
A
Retailer 8
-
$1,966 SGD
View
A
Retailer 9
-
$2,069 SGD
View
A
Retailer 10
-
$2,316 SGD
View
A
Retailer 11
-
$2,382 SGD
View
Retailer 12
-
$2,429 SGD
View
Price last confirmed 16 days ago
Retailer 13
-
$2,497 SGD
View
Price last confirmed 33 days ago
Retailer 14
-
$2,897 SGD
View
Price last confirmed 15 days ago
B+
Retailer 15
-
$3,276 SGD
View
Most Expensive
B+
NZ Jewellers
688d6296-1ba7-4585-9024-79ef1b351d01 · Nov 5
$4,375 SGD
$3,425 USD
View
15 more retailers have this diamond
Prices start from $1,663 SGDSave up to $2,712 SGD

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
$1,663 SGD