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1.51ct K SI1 Round Natural Diamond

EX • K/SI1 • IGI 754512199

Shape and cutting style on the report: Round brilliant

Certificate IGI 754512199

Diamond specifications and retailer prices

From $2,148 USD
As of November 6, 2026
Save $3,442 USD (62%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $5,590 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 754512199. Listed at 19 retailers as of November 5, 2026, with prices from $2,148 to $5,590, a $3,442 spread on the same certified stone. NZ Jewellers lists it at $5,590. 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 angle36.7°
Pavilion angle40.5°
OriginNatural
Grading LabIGI
CertificateIGI 754512199
Dimensions7.17 × 7.23 × 4.57 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
7.17 mm7.23 mm1.51 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 754512199
Side View
Table 56.0%Crown 36.7°Girdle: Slightly ThickPavilion 40.5°Culet: NoneDepth 63.5%

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: $2,148 USD|Low: $2,148 USD|High: $4,740 USD|Avg: $2,937 USD|-2.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 1$2,148 USD
Retailer 9$2,300 USD
Retailer 6$2,424 USD
Retailer 2$2,635 USD
Retailer 10$2,716 USD
Retailer 3$2,863 USD
Retailer 4$3,130 USD
Retailer 5$3,263 USD
Retailer 7$3,302 USD
Retailer 8$4,672 USD

33 data points across 10 retailers

19 retailers$2,148 USD to $5,590 USD

A
Cheapest Retailer
-
$2,148 USD
A
Retailer 2
-
$2,300 USD
View
A
Retailer 3
-
$2,394 USD
View
A
Retailer 4
-
$2,424 USD
View
B+
Retailer 5
-
$2,635 USD
View
Retailer 6
-
$2,674 USD
View
Price last confirmed 8 days ago
B+
Retailer 7
-
$2,674 USD
View
A
Retailer 8
-
$2,716 USD
View
B+
Retailer 9
-
$2,721 USD
View
B+
Retailer 10
-
$2,777 USD
View
B+
Retailer 11
-
$2,815 USD
View
A
Retailer 12
-
$2,863 USD
View
B+
Retailer 13
-
$3,085 USD
View
A
Retailer 14
-
$3,130 USD
View
A
Retailer 15
-
$3,263 USD
View
A
Retailer 16
-
$3,302 USD
View
B+
Retailer 17
-
$4,102 USD
View
B+
Retailer 18
-
$4,672 USD
View
Most Expensive
B
NZ Jewellers
506969c5-90e3-475c-97b0-c094ff3fa585 · Nov 5
$5,590 USD
View
18 more retailers have this diamond
Prices start from $2,148 USDSave up to $3,442 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
$2,148 USD