Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 5556598199

Certificate GIA 5556598199

Diamond specifications and retailer prices

From $684 CAD
$490 USD
As of October 29, 2026
Save $2,130 CAD (76%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $3,069 CAD 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 5556598199. Listed at 19 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
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 5556598199
Dimensions5.08 × 5.12 × 3.17 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Crystal
Top View
5.08 mm5.12 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5556598199
Side View
Table 59.0%Crown 36°Girdle: MED-STKPavilion 40.8°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: Oct 29
Current: $1,145 CAD|Low: $622 CAD|High: $2,287 CAD|Avg: $1,352 CAD
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 31, 2026
Retailer 6$684 CAD
Retailer 1$1,145 CAD
Retailer 2$1,192 CAD
Retailer 4$1,313 CAD
Retailer 8$1,365 CAD
Retailer 7$1,471 CAD
Retailer 3$1,510 CAD
Retailer 5$2,273 CAD

41 data points across 8 retailers

19 retailers$684 CAD to $2,815 CAD

A
Cheapest Retailer
-
$684 CAD
$490 USD
Final sale: no returns
A
Retailer 2
-
$911 CAD
$652 USD
View
Retailer 3
-
$922 CAD
$660 USD
View
Price last confirmed 11 days ago
Retailer 4
-
$954 CAD
$683 USD
View
Price last confirmed 15 days ago
Retailer 5
-
$954 CAD
$683 USD
View
Price last confirmed 16 days ago
Retailer 6
-
$1,023 CAD
$732 USD
View
Price last confirmed 39 days ago
Retailer 7
-
$1,040 CAD
$745 USD
View
Price last confirmed 13 days ago
B+
Retailer 8
-
$1,085 CAD
$777 USD
View
B+
Retailer 9
-
$1,145 CAD
$820 USD
View
B+
Retailer 10
-
$1,173 CAD
$840 USD
View
B+
Retailer 11
-
$1,192 CAD
£672 GBP
View
B
Retailer 12
-
$1,240 CAD
$888 USD
View
B+
Retailer 13
-
$1,313 CAD
€895 EUR
View
B+
Retailer 14
-
$1,365 CAD
$977 USD
View
Retailer 15
-
$1,471 CAD
A$1,621 AUD
View
Price last confirmed 26 days ago
B
Retailer 16
-
$1,510 CAD
ZAR 17,467 ZAR
View
Retailer 17
-
$2,273 CAD
£1,281 GBP
View
Price last confirmed 10 days ago
B
Retailer 18
-
$2,815 CAD
View
Most Expensive
NZ Jewellers
73cd0e3b-7c4d-4c16-b8db-b395cd03d181 · Oct 17
$3,069 CAD
$2,197 USD
View
Price last confirmed 14 days ago
18 more retailers have this diamond
Prices start from $684 CADSave up to $2,130 CAD

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
$684 CAD