Round|Natural|IGI

0.51ct I SI2 Round Natural Diamond

EX • I/SI2 • IGI 841685200

Shape and cutting style on the report: Round brilliant

Certificate IGI 841685200

Diamond specifications and retailer prices

From $278 USD
As of November 6, 2026
Save $1,196 USD (81%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,474 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 841685200. Listed at 12 retailers as of November 4, 2026, with prices from $278 to $1,474, a $1,196 spread on the same certified stone. NZ Jewellers lists it at $1,474. 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 angle34.7°
Pavilion angle40.3°
OriginNatural
Grading LabIGI
CertificateIGI 841685200
Dimensions5.11 × 5.19 × 3.09 mm
L/W Ratio1.02
Girdle conditionFaceted
Cert comments
IDEAL CUT ROUND BRILLIANT
Top View
5.11 mm5.19 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 841685200
Side View
Table 59.0%Crown 34.7°Girdle: MED-STKPavilion 40.3°Culet: NoneDepth 60.2%

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: $1,474 USD|Low: $278 USD|High: $1,474 USD|Avg: $552 USD
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 2$278 USD
Retailer 3$354 USD
Retailer 12$385 USD
Retailer 8$395 USD
Retailer 11$429 USD
Retailer 5$456 USD
Retailer 7$508 USD
Retailer 10$518 USD
Retailer 4$585 USD
Retailer 6$623 USD
Retailer 9$886 USD
NZ Jewellers$1,474 USD

21 data points across 12 retailers

12 retailers$278 USD to $1,474 USD

A
Cheapest Retailer
-
$278 USD
A
Retailer 2
-
$354 USD
View
Final sale: no returns
A
Retailer 3
-
$385 USD
View
A
Retailer 4
-
$395 USD
View
A
Retailer 5
-
$429 USD
View
A
Retailer 6
-
$456 USD
View
A
Retailer 7
-
$508 USD
View
A
Retailer 8
-
$518 USD
View
B+
Retailer 9
-
$585 USD
View
A
Retailer 10
-
$623 USD
View
B
Retailer 11
-
$886 USD
View
Most Expensive
C
NZ Jewellers
b667473d-a753-4bb3-887c-c678a9e7309a · Nov 4
$1,474 USD
View
11 more retailers have this diamond
Prices start from $278 USDSave up to $1,196 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
$278 USD