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1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • IGI 623473316

Shape and cutting style on the report: Round brilliant

Certificate IGI 623473316

Diamond specifications and retailer prices

From $2,111 USD
As of November 6, 2026
Save $2,776 USD (57%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $4,887 USD at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.51ct natural round diamond

This 1.51ct natural round sits in the one-and-a-half to two carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI 623473316. Listed at 15 retailers as of November 5, 2026, with prices from $2,111 to $4,887, a $2,776 spread on the same certified stone. NZ Jewellers lists it at $4,887. 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

1.51
Carat
K
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.4°
Pavilion angle41.1°
OriginNatural
Grading LabIGI
CertificateIGI 623473316
Dimensions7.48 × 7.44 × 4.51 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
7.48 mm7.44 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 623473316
Side View
Table 58.0%Crown 33.4°Girdle: MediumPavilion 41.1°Culet: NoneDepth 60.5%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $4,887 USD|Low: $2,111 USD|High: $5,084 USD|Avg: $2,779 USD|-3.9%
NZ Jewellers
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
November 6, 2026
Retailer 7$2,111 USD
Retailer 10$2,135 USD
Retailer 3$2,223 USD
Retailer 6$2,335 USD
Retailer 4$2,337 USD
Retailer 5$2,337 USD
Retailer 13$2,445 USD
Retailer 11$2,477 USD
Retailer 2$2,545 USD
Retailer 8$2,569 USD
Retailer 14$2,697 USD
Retailer 9$2,853 USD
Retailer 12$2,908 USD
Retailer 15$4,093 USD
NZ Jewellers$4,887 USD

22 data points across 15 retailers

15 retailers$2,111 USD to $4,887 USD

A
Cheapest Retailer
-
$2,111 USD
A
Retailer 2
-
$2,135 USD
View
A
Retailer 3
-
$2,223 USD
View
A
Retailer 4
-
$2,335 USD
View
Retailer 5
-
$2,337 USD
View
Price last confirmed 8 days ago
A
Retailer 6
-
$2,337 USD
View
A
Retailer 7
-
$2,445 USD
View
A
Retailer 8
-
$2,477 USD
View
A
Retailer 9
-
$2,545 USD
View
A
Retailer 10
-
$2,569 USD
View
A
Retailer 11
-
$2,697 USD
View
A
Retailer 12
-
$2,853 USD
View
A
Retailer 13
-
$2,908 USD
View
B+
Retailer 14
-
$4,093 USD
View
Most Expensive
B
NZ Jewellers
64f18f7e-053e-4677-856d-c596d1f2dd3e · Nov 5
$4,887 USD
View
14 more retailers have this diamond
Prices start from $2,111 USDSave up to $2,776 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
1.51ct Round
$2,111 USD