Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 6551723544

Certificate GIA 6551723544

Diamond specifications and retailer prices

From $512 USD
As of October 29, 2026
Save $1,593 USD (76%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $2,291 USD 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 6551723544. 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 angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 6551723544
Dimensions5.09 × 5.13 × 3.14 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Crystal, Cloud
Top View
5.09 mm5.13 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6551723544
Side View
Table 59.0%Crown 36°Girdle: Slightly ThickPavilion 40.6°Culet: NoneDepth 61.5%

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: $951 USD|Low: $465 USD|High: $1,354 USD|Avg: $941 USD|+3.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 30, 2026
Retailer 7$512 USD
Retailer 6$845 USD
Retailer 4$947 USD
Retailer 1$951 USD
Retailer 2$1,005 USD
Retailer 8$1,099 USD
Retailer 3$1,115 USD
Retailer 5$1,345 USD

41 data points across 8 retailers

19 retailers$512 USD to $2,105 USD

A
Cheapest Retailer
-
$512 USD
Final sale: no returns
Retailer 2
-
$650 USD
View
Price last confirmed 10 days ago
Retailer 3
-
$662 USD
View
Price last confirmed 15 days ago
B+
Retailer 4
-
$678 USD
View
Retailer 5
-
$687 USD
View
Price last confirmed 16 days ago
Retailer 6
-
$764 USD
View
Price last confirmed 39 days ago
Retailer 7
-
$771 USD
View
Price last confirmed 13 days ago
B+
Retailer 8
-
$812 USD
View
Retailer 9
-
$845 USD
View
Price last confirmed 9 days ago
B+
Retailer 10
-
$877 USD
View
B
Retailer 11
-
$928 USD
View
Retailer 12
-
$947 USD
£746 GBP
View
Price last confirmed 10 days ago
B+
Retailer 13
-
$951 USD
€906 EUR
View
B
Retailer 14
-
$1,005 USD
£791 GBP
View
Retailer 15
-
$1,099 USD
A$1,690 AUD
View
Price last confirmed 27 days ago
Retailer 16
-
$1,115 USD
ZAR 18,011 ZAR
View
Price last confirmed 9 days ago
Retailer 17
-
$1,345 USD
£1,059 GBP
View
Price last confirmed 12 days ago
B
Retailer 18
-
$2,105 USD
CA$2,923 CAD
View
Most Expensive
NZ Jewellers
a4cbcff7-e570-4ee6-b7d4-edd3e6d6781d · Oct 17
$2,291 USD
View
Price under review
18 more retailers have this diamond
Prices start from $512 USDSave up to $1,593 USD

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
$512 USD