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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 $3,110 USD
HK$24,300 HKD
As of November 1, 2026
Save $3,890 USD (56%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: $7,254 USD 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 October 29, 2026, with a 125% 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
Color
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 1
Current: $3,131 USD|Low: $3,085 USD|High: $7,047 USD|Avg: $4,265 USD|-2.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 7$3,110 USD
Retailer 1$3,131 USD
Retailer 11$3,663 USD
Retailer 2$3,842 USD
Retailer 3$3,960 USD
Retailer 4$4,006 USD
Retailer 5$4,233 USD
Retailer 8$4,444 USD
Retailer 10$4,756 USD
Retailer 6$5,118 USD
Retailer 9$7,000 USD

28 data points across 11 retailers

24 retailers$3,110 USD to $7,000 USD

A
Cheapest Retailer
-
$3,110 USD
HK$24,300 HKD
A
Retailer 2
-
$3,131 USD
₹298,179 INR
View
B+
Retailer 3
-
$3,458 USD
A$5,320 AUD
View
B+
Retailer 4
-
$3,663 USD
View
B+
Retailer 5
-
$3,842 USD
View
Final sale: no returns
B+
Retailer 6
-
$3,923 USD
SGD 5,302 SGD
View
B+
Retailer 7
-
$3,931 USD
A$6,048 AUD
View
B+
Retailer 8
-
$3,960 USD
View
B+
Retailer 9
-
$4,006 USD
£3,155 GBP
View
Retailer 10
-
$4,019 USD
View
Price last confirmed 38 days ago
Retailer 11
-
$4,019 USD
View
Price last confirmed 33 days ago
Retailer 12
-
$4,164 USD
View
Price last confirmed 24 days ago
Retailer 13
-
$4,164 USD
View
Price last confirmed 24 days ago
B+
Retailer 14
-
$4,233 USD
£3,333 GBP
View
B+
Retailer 15
-
$4,312 USD
View
B+
Retailer 16
-
$4,444 USD
€4,232 EUR
View
Retailer 17
-
$4,464 USD
A$6,868 AUD
View
Price last confirmed 28 days ago
B+
Retailer 18
-
$4,756 USD
£3,745 GBP
View
Retailer 19
-
$4,804 USD
View
Price last confirmed 40 days ago
Retailer 20
-
$4,804 USD
View
Price last confirmed 28 days ago
B
Retailer 21
-
$5,118 USD
ZAR 82,683 ZAR
View
B
Retailer 22
-
$7,000 USD
£5,512 GBP
View
Retailer 23
-
$7,001 USD
View
Price last confirmed 36 days ago
Most Expensive
NZ Jewellers
c622d397-570c-4952-9c80-b0d5219df204 · Oct 3
$7,254 USD
View
Price last confirmed 29 days ago
23 more retailers have this diamond
Prices start from $3,110 USDSave up to $3,890 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
$3,110 USD