Round|Natural|IGI

0.51ct I SI2 Round Natural Diamond

EX • I/SI2 • IGI 839658055

Shape and cutting style on the report: Round brilliant

Certificate IGI 839658055

Diamond specifications and retailer prices

From $264 USD
As of November 6, 2026
Save $1,145 USD (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $1,409 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 839658055. Listed at 11 retailers as of November 4, 2026, with prices from $264 to $1,409, a $1,145 spread on the same certified stone. NZ Jewellers lists it at $1,409. 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
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle36.3°
Pavilion angle41.6°
OriginNatural
Grading LabIGI
CertificateIGI 839658055
Dimensions5.02 × 5.04 × 3.22 mm
L/W Ratio1.00
Girdle conditionFaceted
Top View
5.02 mm5.04 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI 839658055
Side View
Table 62.0%Crown 36.3°Girdle: MED-STKPavilion 41.6°Culet: NoneDepth 62.2%

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: $1,409 USD|Low: $264 USD|High: $1,409 USD|Avg: $550 USD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 2$264 USD
Retailer 9$338 USD
Retailer 7$410 USD
Retailer 3$436 USD
Retailer 5$488 USD
Retailer 6$495 USD
Retailer 10$570 USD
Retailer 4$599 USD
Retailer 8$848 USD
NZ Jewellers$1,409 USD

21 data points across 10 retailers

11 retailers$264 USD to $1,409 USD

A
Cheapest Retailer
-
$264 USD
A
Retailer 2
-
$338 USD
View
Final sale: no returns
B+
Retailer 3
-
$368 USD
View
B+
Retailer 4
-
$410 USD
View
A
Retailer 5
-
$436 USD
View
B+
Retailer 6
-
$488 USD
View
B+
Retailer 7
-
$495 USD
View
B+
Retailer 8
-
$570 USD
View
B+
Retailer 9
-
$599 USD
View
B
Retailer 10
-
$848 USD
View
Most Expensive
C
NZ Jewellers
f4087ce1-d799-425c-9e0a-733ab293a0cb · Nov 4
$1,409 USD
View
10 more retailers have this diamond
Prices start from $264 USDSave up to $1,145 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
$264 USD