Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2556603477

Certificate GIA 2556603477

Diamond specifications and retailer prices

From £382 GBP
$512 USD
As of October 29, 2026
Save £1,189 GBP (76%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £1,710 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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2556603477. Listed at 21 retailers as of October 29, 2026, with a 311% 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
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 2556603477
Dimensions5.06 × 5.10 × 3.16 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Cloud
Top View
5.06 mm5.10 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556603477
Side View
Table 61.0%Crown 34.5°Girdle: Slightly ThickPavilion 41.6°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: Oct 29
Current: £705 GBP|Low: £347 GBP|High: £1,010 GBP|Avg: £713 GBP|+3.4%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 1, 2026
Retailer 7£382 GBP
Retailer 6£631 GBP
Retailer 4£651 GBP
Retailer 1£705 GBP
Retailer 2£706 GBP
Retailer 9£762 GBP
Retailer 8£820 GBP
Retailer 5£842 GBP
Retailer 3£999 GBP

41 data points across 9 retailers

21 retailers£382 GBP to £1,571 GBP

A
Cheapest Retailer
-
£382 GBP
$512 USD
Final sale: no returns
Retailer 2
-
£485 GBP
$650 USD
View
Price last confirmed 12 days ago
Retailer 3
-
£494 GBP
$662 USD
View
Price last confirmed 17 days ago
Retailer 4
-
£494 GBP
$662 USD
View
Price last confirmed 62 days ago
B+
Retailer 5
-
£506 GBP
$678 USD
View
Retailer 6
-
£513 GBP
$687 USD
View
Price last confirmed 17 days ago
Retailer 7
-
£570 GBP
$764 USD
View
Price last confirmed 40 days ago
B+
Retailer 8
-
£575 GBP
$771 USD
View
B+
Retailer 9
-
£606 GBP
$812 USD
View
B
Retailer 10
-
£631 GBP
$845 USD
View
B
Retailer 11
-
£651 GBP
View
B
Retailer 12
-
£655 GBP
$877 USD
View
B+
Retailer 13
-
£693 GBP
$928 USD
View
B+
Retailer 14
-
£705 GBP
€900 EUR
View
B+
Retailer 15
-
£706 GBP
View
B
Retailer 16
-
£762 GBP
$1,021 USD
View
Retailer 17
-
£820 GBP
A$1,690 AUD
View
Price last confirmed 29 days ago
B
Retailer 18
-
£842 GBP
ZAR 18,217 ZAR
View
B
Retailer 19
-
£999 GBP
View
B
Retailer 20
-
£1,571 GBP
CA$2,923 CAD
View
Most Expensive
NZ Jewellers
9d058924-124d-4d64-be57-fd7bf0c3d098 · Oct 17
£1,710 GBP
$2,291 USD
View
Price under review
20 more retailers have this diamond
Prices start from £382 GBPSave up to £1,189 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
£382 GBP