Round|Natural|GIA

0.51ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 7556598440

Certificate GIA 7556598440

Diamond specifications and retailer prices

From $490 USD
As of October 31, 2026
Save $1,525 USD (76%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: $2,197 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 7556598440. Listed at 20 retailers as of October 30, 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 angle41°
OriginNatural
Grading LabGIA
CertificateGIA 7556598440
Dimensions5.07 × 5.10 × 3.16 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Cloud
Top View
5.07 mm5.10 mm0.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 7556598440
Side View
Table 59.0%Crown 36°Girdle: Slightly ThickPavilion 41°Culet: NoneDepth 62.1%

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: $820 USD|Low: $490 USD|High: $1,637 USD|Avg: $999 USD
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 31, 2026
Retailer 7$490 USD
Retailer 1$820 USD
Retailer 2$854 USD
Retailer 5$909 USD
Retailer 4$940 USD
Retailer 8$1,053 USD
Retailer 3$1,081 USD
Retailer 6$1,627 USD

40 data points across 8 retailers

20 retailers$490 USD to $2,015 USD

A
Cheapest Retailer
-
$490 USD
Final sale: no returns
A
Retailer 2
-
$652 USD
View
Retailer 3
-
$660 USD
View
Price last confirmed 12 days ago
Retailer 4
-
$683 USD
View
Price last confirmed 15 days ago
Retailer 5
-
$683 USD
View
Price last confirmed 16 days ago
Retailer 6
-
$732 USD
View
Price last confirmed 39 days ago
Retailer 7
-
$745 USD
View
Price last confirmed 13 days ago
B+
Retailer 8
-
$777 USD
View
B+
Retailer 9
-
$820 USD
View
B+
Retailer 10
-
$840 USD
View
B
Retailer 11
-
$854 USD
£672 GBP
View
B
Retailer 12
-
$888 USD
View
B+
Retailer 13
-
$909 USD
£716 GBP
View
B+
Retailer 14
-
$940 USD
€895 EUR
View
B+
Retailer 15
-
$977 USD
View
Retailer 16
-
$1,053 USD
A$1,621 AUD
View
Price last confirmed 26 days ago
B
Retailer 17
-
$1,081 USD
ZAR 17,467 ZAR
View
Retailer 18
-
$1,627 USD
£1,281 GBP
View
Price last confirmed 12 days ago
B
Retailer 19
-
$2,015 USD
CA$2,799 CAD
View
Most Expensive
NZ Jewellers
dd0a0fcd-78f4-4e8d-ba0f-67e1a70c174b · Oct 17
$2,197 USD
View
Price last confirmed 14 days ago
19 more retailers have this diamond
Prices start from $490 USDSave up to $1,525 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
$490 USD