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0.51ct I SI2 Round Natural Diamond

EX • I/SI2 • IGI 670417121

Shape and cutting style on the report: Round brilliant

Certificate IGI 670417121

Diamond specifications and retailer prices

From $259 USD
As of November 6, 2026
Save $1,120 USD (81%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,379 USD at NZ Jewellers · As of November 4, 2026
View at NZ Jewellers

About this 0.51ct natural round diamond

This 0.51ct natural round sits in the half to three-quarter carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI 670417121. Listed at 12 retailers as of November 4, 2026, with prices from $259 to $1,379, a $1,120 spread on the same certified stone. NZ Jewellers lists it at $1,379. 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

0.51
Carat
I
Color
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.6°
Pavilion angle41°
OriginNatural
Grading LabIGI
CertificateIGI 670417121
Dimensions5.10 × 5.05 × 3.18 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
5.10 mm5.05 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 670417121
Side View
Table 57.0%Crown 35.6°Girdle: MED-STKPavilion 41°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 6
Current: $259 USD|Low: $259 USD|High: $840 USD|Avg: $477 USD|-1.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 1$259 USD
Retailer 5$331 USD
Retailer 3$370 USD
Retailer 6$389 USD
Retailer 7$508 USD
Retailer 2$585 USD
Retailer 4$830 USD

44 data points across 7 retailers

12 retailers$259 USD to $1,379 USD

A
Cheapest Retailer
-
$259 USD
A
Retailer 2
-
$331 USD
View
Final sale: no returns
A
Retailer 3
-
$360 USD
View
A
Retailer 4
-
$370 USD
View
Retailer 5
-
$388 USD
View
Price last confirmed 8 days ago
A
Retailer 6
-
$401 USD
View
A
Retailer 7
-
$484 USD
View
A
Retailer 8
-
$490 USD
View
A
Retailer 9
-
$508 USD
View
A
Retailer 10
-
$585 USD
View
B+
Retailer 11
-
$830 USD
View
Most Expensive
B
NZ Jewellers
027d91a0-08be-4dfe-9965-8ccb7e7514a0 · Nov 4
$1,379 USD
View
11 more retailers have this diamond
Prices start from $259 USDSave up to $1,120 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
0.51ct Round
$259 USD