Round|Natural|GIA

1.00ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 240

Certificate GIA 240

Diamond specifications and retailer prices

From $1,315 USD
As of November 5, 2026
Save $1,893 USD (59%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $3,462 USD at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA. Listed at 11 retailers as of November 5, 2026, with a 144% 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
K
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 240
Dimensions6.46 × 6.50 × 3.91 mm
L/W Ratio1.01
Top View
6.46 mm6.50 mm1.00 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 240
Side View
Table 59.0%CrownGirdle: THN-MEDPavilionCulet: NoneDepth 60.2%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 5
Current: $3,208 USD|Low: $1,315 USD|High: $3,462 USD|Avg: $1,801 USD|-7.3%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 24, 2026
Retailer 2$1,315 USD
Retailer 4$1,315 USD
Retailer 5$1,344 USD
Retailer 3$1,376 USD
Retailer 6$1,518 USD
Retailer 7$1,664 USD
Retailer 8$1,705 USD
Retailer 9$1,998 USD
NZ Jewellers$3,208 USD

18 data points across 9 retailers

11 retailers$1,315 USD to $3,208 USD

A
Cheapest Retailer
-
$1,315 USD
Retailer 2
-
$1,315 USD
View
Price last confirmed 8 days ago
A
Retailer 3
-
$1,344 USD
View
A
Retailer 4
-
$1,376 USD
View
Retailer 5
-
$1,419 USD
View
Price last confirmed 43 days ago
A
Retailer 6
-
$1,518 USD
View
Retailer 7
-
$1,638 USD
View
Price last confirmed 45 days ago
Retailer 8
-
$1,664 USD
View
Price last confirmed 30 days ago
Retailer 9
-
$1,705 USD
View
Price last confirmed 30 days ago
B
Retailer 10
-
$3,208 USD
View
Most Expensive
NZ Jewellers
cc9b158d-30ec-4b7a-8bf3-4d1f069758aa · Sep 25
$3,462 USD
View
Price last confirmed 41 days ago
10 more retailers have this diamond
Prices start from $1,315 USDSave up to $1,893 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
$1,315 USD