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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 £196 GBP
As of November 6, 2026
Save £851 GBP (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,047 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 839658055. Listed at 11 retailers as of November 4, 2026, with prices from £196 to £1,047, a £851 spread on the same certified stone. NZ Jewellers lists it at £1,047. 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
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: £1,047 GBP|Low: £196 GBP|High: £1,047 GBP|Avg: £409 GBP
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£196 GBP
Retailer 9£251 GBP
Retailer 7£305 GBP
Retailer 3£324 GBP
Retailer 5£363 GBP
Retailer 6£368 GBP
Retailer 10£424 GBP
Retailer 4£445 GBP
Retailer 8£630 GBP
NZ Jewellers£1,047 GBP

21 data points across 10 retailers

11 retailers£196 GBP to £1,047 GBP

A
Cheapest Retailer
-
£196 GBP
A
Retailer 2
-
£251 GBP
View
Final sale: no returns
B+
Retailer 3
-
£273 GBP
View
B+
Retailer 4
-
£305 GBP
View
A
Retailer 5
-
£324 GBP
View
B+
Retailer 6
-
£363 GBP
View
B+
Retailer 7
-
£368 GBP
View
B+
Retailer 8
-
£424 GBP
View
B+
Retailer 9
-
£445 GBP
View
B
Retailer 10
-
£630 GBP
View
Most Expensive
C
NZ Jewellers
f4087ce1-d799-425c-9e0a-733ab293a0cb · Nov 4
£1,047 GBP
$1,409 USD
View
10 more retailers have this diamond
Prices start from £196 GBPSave up to £851 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
£196 GBP