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0.51ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 7426956403

Certificate GIA 7426956403

Diamond specifications and retailer prices

From £625 GBP
As of November 4, 2026
Save £742 GBP (54%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £1,367 GBP at MOH London · As of November 4, 2026
View at MOH London

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 GIA 7426956403. Listed at 12 retailers as of November 4, 2026, with prices from £625 to £1,367, a £742 spread on the same certified stone. MOH London lists it at £1,367. 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 angle34°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 7426956403
Dimensions5.18 × 5.14 × 3.16 mm
L/W Ratio1.01
Top View
5.18 mm5.14 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 7426956403
Side View
Table 56.0%Crown 34°Girdle: MediumPavilion 41.2°Culet: NoneDepth 61.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £1,367 GBP|Low: £534 GBP|High: £1,386 GBP|Avg: £898 GBP|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 5, 2026
Retailer 6£625 GBP
Retailer 5£632 GBP
Retailer 4£692 GBP
Retailer 7£704 GBP
Retailer 3£871 GBP
Retailer 2£973 GBP
MOH London£1,367 GBP

42 data points across 7 retailers

12 retailers£625 GBP to £1,367 GBP

B+
Cheapest Retailer
-
£625 GBP
Final sale: no returns
B+
Retailer 2
-
£632 GBP
View
B+
Retailer 3
-
£692 GBP
View
B+
Retailer 4
-
£704 GBP
View
Retailer 5
-
£782 GBP
View
Price last confirmed 10 days ago
B
Retailer 6
-
£832 GBP
View
B
Retailer 7
-
£832 GBP
View
B
Retailer 8
-
£862 GBP
View
B
Retailer 9
-
£871 GBP
View
B
Retailer 10
-
£973 GBP
View
Most Expensive
B
MOH London
F91F95726 · Nov 4
£1,367 GBP
View
10 more retailers have this diamond
Prices start from £625 GBPSave up to £742 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.

B+
0.51ct Round
£625 GBP