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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 €249 EUR
As of November 6, 2026
Save €1,071 EUR (81%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: €1,320 EUR 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 €249 to €1,320, a €1,071 spread on the same certified stone. NZ Jewellers lists it at €1,320. 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
Colour
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: €1,320 EUR|Low: €249 EUR|High: €1,320 EUR|Avg: €494 EUR
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€249 EUR
Retailer 3€317 EUR
Retailer 12€345 EUR
Retailer 8€354 EUR
Retailer 11€384 EUR
Retailer 5€408 EUR
Retailer 7€455 EUR
Retailer 10€464 EUR
Retailer 4€524 EUR
Retailer 6€558 EUR
Retailer 9€794 EUR
NZ Jewellers€1,320 EUR

21 data points across 12 retailers

12 retailers€249 EUR to €1,320 EUR

A
Cheapest Retailer
-
€249 EUR
A
Retailer 2
-
€317 EUR
View
Final sale: no returns
A
Retailer 3
-
€345 EUR
View
A
Retailer 4
-
€354 EUR
View
A
Retailer 5
-
€384 EUR
View
A
Retailer 6
-
€408 EUR
View
A
Retailer 7
-
€455 EUR
View
A
Retailer 8
-
€464 EUR
View
B+
Retailer 9
-
€524 EUR
View
A
Retailer 10
-
€558 EUR
View
B
Retailer 11
-
€794 EUR
View
Most Expensive
C
NZ Jewellers
b667473d-a753-4bb3-887c-c678a9e7309a · Nov 4
€1,320 EUR
$1,474 USD
View
11 more retailers have this diamond
Prices start from €249 EURSave up to €1,071 EUR

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
€249 EUR