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Round|Natural|GIA

1.00ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 2557652255

Certificate GIA 2557652255

Diamond specifications and retailer prices

From $4,278 AUD
As of November 6, 2026
Save $5,668 AUD (57%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $10,362 AUD at NZ Jewellers · As of October 3, 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 2557652255. Listed at 24 retailers as of November 2, 2026, with a 132% 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 angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 2557652255
Dimensions6.36 × 6.42 × 4.01 mm
L/W Ratio1.01
Star length50%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Cavity, Needle
Top View
6.36 mm6.42 mm1.00 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557652255
Side View
Table 56.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.7%

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: $4,278 AUD|Low: $4,278 AUD|High: $10,054 AUD|Avg: $6,363 AUD|-5.1%
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
November 6, 2026
Retailer 1$4,278 AUD
Retailer 13$4,297 AUD
Retailer 4$4,773 AUD
Retailer 3$5,051 AUD
Retailer 5$5,298 AUD
Retailer 8$5,407 AUD
Retailer 2$5,471 AUD
Retailer 7$5,493 AUD
Retailer 9$5,744 AUD
Retailer 14$5,950 AUD
Retailer 10$6,303 AUD
Retailer 12$6,558 AUD
Retailer 11$7,007 AUD
Retailer 6$9,947 AUD

25 data points across 14 retailers

24 retailers$4,278 AUD to $9,947 AUD

A
Cheapest Retailer
-
$4,278 AUD
A
Retailer 2
-
$4,297 AUD
View
B+
Retailer 3
-
$4,773 AUD
View
B+
Retailer 4
-
$5,051 AUD
View
B+
Retailer 5
-
$5,298 AUD
View
Final sale: no returns
B+
Retailer 6
-
$5,407 AUD
View
B+
Retailer 7
-
$5,471 AUD
View
B+
Retailer 8
-
$5,493 AUD
View
B+
Retailer 9
-
$5,615 AUD
View
Retailer 10
-
$5,741 AUD
View
Price last confirmed 43 days ago
Retailer 11
-
$5,741 AUD
View
Price last confirmed 38 days ago
B+
Retailer 12
-
$5,744 AUD
View
Retailer 13
-
$5,948 AUD
View
Price last confirmed 29 days ago
Retailer 14
-
$5,948 AUD
View
Price last confirmed 29 days ago
B+
Retailer 15
-
$5,950 AUD
View
B+
Retailer 16
-
$6,303 AUD
View
Retailer 17
-
$6,377 AUD
View
Price last confirmed 33 days ago
B+
Retailer 18
-
$6,558 AUD
View
Retailer 19
-
$6,863 AUD
View
Price last confirmed 45 days ago
Retailer 20
-
$6,863 AUD
View
Price last confirmed 33 days ago
B+
Retailer 21
-
$7,007 AUD
View
B
Retailer 22
-
$9,947 AUD
View
Retailer 23
-
$10,001 AUD
View
Price last confirmed 41 days ago
Most Expensive
NZ Jewellers
c622d397-570c-4952-9c80-b0d5219df204 · Oct 3
$10,362 AUD
$7,254 USD
View
Price last confirmed 34 days ago
23 more retailers have this diamond
Prices start from $4,278 AUDSave up to $5,668 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
$4,278 AUD