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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 $4,234 NZD
As of November 6, 2026
Save $5,107 NZD (55%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $10,974 NZD 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
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $6,134 NZD|Low: $4,212 NZD|High: $10,421 NZD|Avg: $6,054 NZD|-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$4,234 NZD
Retailer 3$4,543 NZD
Retailer 16$4,620 NZD
Retailer 6$4,684 NZD
Retailer 17$4,693 NZD
Retailer 13$4,972 NZD
Retailer 9$5,025 NZD
Retailer 11$5,762 NZD
Retailer 2$5,781 NZD
Retailer 4$5,781 NZD
Retailer 5$5,977 NZD
Retailer 1$6,134 NZD
Retailer 14$6,639 NZD
Retailer 8$6,746 NZD
Retailer 7$6,795 NZD
Retailer 10$6,835 NZD
Retailer 12$9,341 NZD

30 data points across 17 retailers

20 retailers$4,234 NZD to $9,341 NZD

A
Cheapest Retailer
-
$4,234 NZD
A
Retailer 2
-
$4,543 NZD
View
A
Retailer 3
-
$4,620 NZD
View
A
Retailer 4
-
$4,684 NZD
View
Final sale: no returns
A
Retailer 5
-
$4,693 NZD
View
A
Retailer 6
-
$4,972 NZD
View
Retailer 7
-
$5,707 NZD
View
Price last confirmed 36 days ago
A
Retailer 8
-
$5,762 NZD
View
A
Retailer 9
-
$5,781 NZD
View
B+
Retailer 10
-
$5,781 NZD
View
Retailer 11
-
$5,926 NZD
View
Price last confirmed 38 days ago
B+
Retailer 12
-
$5,977 NZD
View
B+
Retailer 13
-
$6,134 NZD
View
Retailer 14
-
$6,584 NZD
View
Price last confirmed 38 days ago
B+
Retailer 15
-
$6,639 NZD
View
Retailer 16
-
$6,746 NZD
View
Price last confirmed 35 days ago
Retailer 17
-
$6,795 NZD
View
Price last confirmed 14 days ago
B+
Retailer 18
-
$6,835 NZD
View
B
Retailer 19
-
$9,341 NZD
View
Most Expensive
NZ Jewellers
edd1479b-0c61-4ddb-aba2-9fc4530b17a1 · Sep 27
$10,974 NZD
$6,169 USD
View
Price last confirmed 40 days ago
19 more retailers have this diamond
Prices start from $4,234 NZDSave up to $5,107 NZD

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
$4,234 NZD