Round|Natural|GIA

1.00ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2566189059

Certificate GIA 2566189059

Diamond specifications and retailer prices

From $2,445 USD
As of October 30, 2026
Save $3,855 USD (61%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: $6,300 USD at NZ Jewellers · As of October 30, 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2566189059. Listed at 22 retailers as of October 30, 2026, with prices from $2,445 to $6,300, a $3,855 spread on the same certified stone. NZ Jewellers lists it at $6,300. 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
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle33°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 2566189059
Dimensions6.41 × 6.44 × 3.96 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.41 mm6.44 mm1.00 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 2566189059
Side View
Table 59.0%Crown 33°Girdle: THN-STKPavilion 41.6°Culet: NoneDepth 61.6%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: $6,300 USD|Low: $1,956 USD|High: $6,300 USD|Avg: $2,836 USD
NZ Jewellers
Retailer 2
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Retailer 27
October 30, 2026
Retailer 10$1,956 USD
Retailer 16$2,068 USD
Retailer 12$2,124 USD
Retailer 8$2,150 USD
Retailer 19$2,313 USD
Retailer 3$2,445 USD
Retailer 14$2,517 USD
Retailer 5$2,525 USD
Retailer 9$2,664 USD
Retailer 18$2,665 USD
Retailer 4$2,685 USD
Retailer 11$2,692 USD
Retailer 25$2,730 USD
Retailer 27$2,730 USD
Retailer 26$2,835 USD
Retailer 13$2,908 USD
Retailer 6$3,096 USD
Retailer 7$3,150 USD
Retailer 21$3,203 USD
Retailer 20$3,296 USD
Retailer 15$3,467 USD
Retailer 22$3,499 USD
Retailer 2$3,529 USD
Retailer 24$3,669 USD
Retailer 17$3,806 USD
Retailer 23$5,066 USD
NZ Jewellers$6,300 USD

26 data points across 27 retailers

22 retailers$2,445 USD to $6,300 USD

Retailer 1
-
$2,124 USD
Price last confirmed 17 days ago
Retailer 2
-
$2,150 USD
View
Price last confirmed 17 days ago
Retailer 3
-
$2,313 USD
SGD 3,125 SGD
View
Price last confirmed 17 days ago
B+
Retailer 4
-
$2,445 USD
View
B+
Retailer 5
-
$2,505 USD
View
B+
Retailer 6
-
$2,525 USD
View
B+
Retailer 7
-
$2,685 USD
View
Retailer 8
-
$2,692 USD
£2,120 GBP
View
Price last confirmed 14 days ago
B+
Retailer 9
-
$2,730 USD
View
B+
Retailer 10
-
$2,730 USD
View
B+
Retailer 11
-
$2,835 USD
View
B+
Retailer 12
-
$2,908 USD
£2,290 GBP
View
B
Retailer 13
-
$3,096 USD
View
B
Retailer 14
-
$3,149 USD
View
B
Retailer 15
-
$3,150 USD
View
B
Retailer 16
-
$3,203 USD
£2,522 GBP
View
Retailer 17
-
$3,467 USD
View
Price last confirmed 16 days ago
B
Retailer 18
-
$3,529 USD
€3,361 EUR
View
B
Retailer 19
-
$3,669 USD
ZAR 59,278 ZAR
View
Retailer 20
-
$3,806 USD
View
Price last confirmed 16 days ago
B
Retailer 21
-
$5,066 USD
£3,989 GBP
View
Most Expensive
B
NZ Jewellers
6443b987-1d38-4d76-b20b-560ff4338924 · Oct 30
$6,300 USD
View
21 more retailers have this diamond
Prices start from $2,445 USDSave up to $3,855 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.

B+
1.00ct Round
$2,445 USD