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Round|Natural|GIA

1.00ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 2558368590

Certificate GIA 2558368590

Diamond specifications and retailer prices

From $3,040 SGD
As of November 6, 2026
Save $3,667 SGD (55%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $7,880 SGD at NZ Jewellers · As of September 27, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2558368590. Listed at 20 retailers as of November 4, 2026, with a 121% 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
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.5°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 2558368590
Dimensions6.46 × 6.42 × 3.92 mm
L/W Ratio1.01
Girdle conditionFaceted
Top View
6.46 mm6.42 mm1.00 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2558368590
Side View
Table 59.0%Crown 31.5°Girdle: Slightly ThickPavilion 41.6°Culet: NoneDepth 60.9%

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 6
Current: $4,404 SGD|Low: $3,025 SGD|High: $7,482 SGD|Avg: $4,347 SGD|-10.0%
Retailer 1
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
Retailer 15
Retailer 16
Retailer 17
November 5, 2026
Retailer 15$3,040 SGD
Retailer 3$3,262 SGD
Retailer 16$3,317 SGD
Retailer 6$3,363 SGD
Retailer 17$3,370 SGD
Retailer 13$3,570 SGD
Retailer 9$3,608 SGD
Retailer 11$4,137 SGD
Retailer 2$4,151 SGD
Retailer 4$4,151 SGD
Retailer 5$4,292 SGD
Retailer 1$4,404 SGD
Retailer 14$4,767 SGD
Retailer 8$4,844 SGD
Retailer 7$4,879 SGD
Retailer 10$4,907 SGD
Retailer 12$6,707 SGD

30 data points across 17 retailers

20 retailers$3,040 SGD to $6,707 SGD

A
Cheapest Retailer
-
$3,040 SGD
A
Retailer 2
-
$3,262 SGD
View
A
Retailer 3
-
$3,317 SGD
View
A
Retailer 4
-
$3,363 SGD
View
Final sale: no returns
A
Retailer 5
-
$3,370 SGD
View
A
Retailer 6
-
$3,570 SGD
View
Retailer 7
-
$4,098 SGD
View
Price last confirmed 36 days ago
A
Retailer 8
-
$4,137 SGD
View
A
Retailer 9
-
$4,151 SGD
View
B+
Retailer 10
-
$4,151 SGD
View
Retailer 11
-
$4,255 SGD
View
Price last confirmed 38 days ago
B+
Retailer 12
-
$4,292 SGD
View
B+
Retailer 13
-
$4,404 SGD
View
Retailer 14
-
$4,727 SGD
View
Price last confirmed 38 days ago
B+
Retailer 15
-
$4,767 SGD
View
Retailer 16
-
$4,844 SGD
View
Price last confirmed 35 days ago
Retailer 17
-
$4,879 SGD
View
Price last confirmed 14 days ago
B+
Retailer 18
-
$4,907 SGD
View
B
Retailer 19
-
$6,707 SGD
View
Most Expensive
NZ Jewellers
edd1479b-0c61-4ddb-aba2-9fc4530b17a1 · Sep 27
$7,880 SGD
$6,169 USD
View
Price last confirmed 40 days ago
19 more retailers have this diamond
Prices start from $3,040 SGDSave up to $3,667 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
$3,040 SGD