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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 £207 GBP
As of November 6, 2026
Save £889 GBP (81%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £1,095 GBP 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 £207 to £1,095, a £889 spread on the same certified stone. NZ Jewellers lists it at £1,095. 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: £1,095 GBP|Low: £207 GBP|High: £1,095 GBP|Avg: £410 GBP
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£207 GBP
Retailer 3£263 GBP
Retailer 12£286 GBP
Retailer 8£293 GBP
Retailer 11£319 GBP
Retailer 5£339 GBP
Retailer 7£377 GBP
Retailer 10£385 GBP
Retailer 4£435 GBP
Retailer 6£463 GBP
Retailer 9£658 GBP
NZ Jewellers£1,095 GBP

21 data points across 12 retailers

12 retailers£207 GBP to £1,095 GBP

A
Cheapest Retailer
-
£207 GBP
A
Retailer 2
-
£263 GBP
View
Final sale: no returns
A
Retailer 3
-
£286 GBP
View
A
Retailer 4
-
£293 GBP
View
A
Retailer 5
-
£319 GBP
View
A
Retailer 6
-
£339 GBP
View
A
Retailer 7
-
£377 GBP
View
A
Retailer 8
-
£385 GBP
View
B+
Retailer 9
-
£435 GBP
View
A
Retailer 10
-
£463 GBP
View
B
Retailer 11
-
£658 GBP
View
Most Expensive
C
NZ Jewellers
b667473d-a753-4bb3-887c-c678a9e7309a · Nov 4
£1,095 GBP
$1,474 USD
View
11 more retailers have this diamond
Prices start from £207 GBPSave up to £889 GBP

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
£207 GBP