Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1558723449

Certificate GIA 1558723449

Diamond specifications and retailer prices

From £354 GBP
$474 USD
As of October 31, 2026
Save £1,105 GBP (76%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £1,593 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 1558723449. Listed at 20 retailers as of October 30, 2026, with a 312% 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 angle33°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1558723449
Dimensions5.16 × 5.18 × 3.10 mm
L/W Ratio1.00
Culet sizeNone
Key to symbols
Cloud, Feather
Top View
5.16 mm5.18 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1558723449
Side View
Table 61.0%Crown 33°Girdle: Slightly ThickPavilion 41°Culet: NoneDepth 59.9%

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 31
Current: £677 GBP|Low: £354 GBP|High: £1,187 GBP|Avg: £714 GBP|+2.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 1, 2026
Retailer 7£354 GBP
Retailer 5£601 GBP
Retailer 4£624 GBP
Retailer 2£657 GBP
Retailer 1£677 GBP
Retailer 8£764 GBP
Retailer 6£784 GBP
Retailer 3£1,172 GBP

37 data points across 8 retailers

20 retailers£354 GBP to £1,459 GBP

A
Cheapest Retailer
-
£354 GBP
$474 USD
Final sale: no returns
Retailer 2
-
£460 GBP
$616 USD
View
Price last confirmed 62 days ago
A
Retailer 3
-
£474 GBP
$635 USD
View
Retailer 4
-
£479 GBP
$642 USD
View
Price last confirmed 12 days ago
Retailer 5
-
£496 GBP
$664 USD
View
Price last confirmed 16 days ago
Retailer 6
-
£496 GBP
$664 USD
View
Price last confirmed 17 days ago
Retailer 7
-
£531 GBP
$711 USD
View
Price last confirmed 40 days ago
B+
Retailer 8
-
£543 GBP
$727 USD
View
B+
Retailer 9
-
£563 GBP
$754 USD
View
B+
Retailer 10
-
£601 GBP
$805 USD
View
B+
Retailer 11
-
£608 GBP
$815 USD
View
B+
Retailer 12
-
£624 GBP
View
B+
Retailer 13
-
£643 GBP
$862 USD
View
B+
Retailer 14
-
£657 GBP
View
B
Retailer 15
-
£677 GBP
€864 EUR
View
Retailer 16
-
£764 GBP
A$1,574 AUD
View
Price last confirmed 28 days ago
B
Retailer 17
-
£784 GBP
ZAR 16,968 ZAR
View
B
Retailer 18
-
£1,172 GBP
View
B
Retailer 19
-
£1,459 GBP
CA$2,715 CAD
View
Most Expensive
NZ Jewellers
de064202-05b1-4c7f-86ba-6583191e01de · Oct 17
£1,593 GBP
$2,134 USD
View
Price last confirmed 15 days ago
19 more retailers have this diamond
Prices start from £354 GBPSave up to £1,105 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
£354 GBP