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Round|Natural|GIA

0.51ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 1559634200

Certificate GIA 1559634200

Diamond specifications and retailer prices

From £274 GBP
As of November 6, 2026
Save £559 GBP (67%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,194 GBP at NZ Jewellers · As of October 17, 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 GIA 1559634200. Listed at 14 retailers as of November 4, 2026, with a 204% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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 angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1559634200
Dimensions5.10 × 5.07 × 3.17 mm
L/W Ratio1.01
Girdle conditionFaceted
Top View
5.10 mm5.07 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1559634200
Side View
Table 58.0%Crown 35.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.3%

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: £1,194 GBP|Low: £274 GBP|High: £1,233 GBP|Avg: £497 GBP|-3.2%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 2£274 GBP
Retailer 12£314 GBP
Retailer 13£316 GBP
Retailer 10£334 GBP
Retailer 3£403 GBP
Retailer 4£410 GBP
Retailer 5£410 GBP
Retailer 6£442 GBP
Retailer 11£455 GBP
Retailer 9£474 GBP
Retailer 8£504 GBP
Retailer 7£834 GBP
NZ Jewellers£1,194 GBP

33 data points across 13 retailers

14 retailers£274 GBP to £834 GBP

A
Cheapest Retailer
-
£274 GBP
A
Retailer 2
-
£314 GBP
View
A
Retailer 3
-
£316 GBP
View
A
Retailer 4
-
£334 GBP
View
Final sale: no returns
Retailer 5
-
£403 GBP
View
Price last confirmed 10 days ago
Retailer 6
-
£410 GBP
View
Price last confirmed 22 days ago
Retailer 7
-
£410 GBP
View
Price last confirmed 22 days ago
A
Retailer 8
-
£442 GBP
View
A
Retailer 9
-
£455 GBP
View
Retailer 10
-
£472 GBP
View
Price last confirmed 45 days ago
A
Retailer 11
-
£474 GBP
View
B+
Retailer 12
-
£504 GBP
View
B
Retailer 13
-
£834 GBP
View
Most Expensive
NZ Jewellers
1a645d7a-b52f-4944-866d-8aa16a9d2074 · Oct 17
£1,194 GBP
$1,607 USD
View
Price last confirmed 20 days ago
13 more retailers have this diamond
Prices start from £274 GBPSave up to £559 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
£274 GBP