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Round|Natural|GIA

0.51ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 7558959697

Certificate GIA 7558959697

Diamond specifications and retailer prices

From $382 USD
As of November 6, 2026
Save $781 USD (67%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: $1,620 USD at NZ Jewellers · As of October 23, 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 7558959697. Listed at 14 retailers as of November 2, 2026, with a 204% 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle34.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 7558959697
Dimensions5.15 × 5.17 × 3.15 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Top View
5.15 mm5.17 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 7558959697
Side View
Table 57.0%Crown 34.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.1%

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: Nov 6
Current: $1,620 USD|Low: $382 USD|High: $1,674 USD|Avg: $693 USD|-3.2%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 6, 2026
Retailer 2$382 USD
Retailer 13$435 USD
Retailer 3$440 USD
Retailer 10$464 USD
Retailer 12$543 USD
Retailer 4$556 USD
Retailer 5$556 USD
Retailer 6$621 USD
Retailer 11$629 USD
Retailer 9$660 USD
Retailer 7$701 USD
Retailer 8$1,163 USD
NZ Jewellers$1,620 USD

36 data points across 13 retailers

14 retailers$382 USD to $1,163 USD

A
Cheapest Retailer
-
$382 USD
A
Retailer 2
-
$435 USD
View
A
Retailer 3
-
$440 USD
View
A
Retailer 4
-
$464 USD
View
Final sale: no returns
Retailer 5
-
$543 USD
View
Price last confirmed 8 days ago
Retailer 6
-
$556 USD
View
Price last confirmed 15 days ago
Retailer 7
-
$556 USD
View
Price last confirmed 10 days ago
Retailer 8
-
$621 USD
View
Price last confirmed 45 days ago
A
Retailer 9
-
$621 USD
View
A
Retailer 10
-
$629 USD
View
B+
Retailer 11
-
$660 USD
View
B+
Retailer 12
-
$701 USD
View
B
Retailer 13
-
$1,163 USD
View
Most Expensive
NZ Jewellers
093759c2-dd4f-48fd-9709-e17d9a3668cf · Oct 23
$1,620 USD
View
Price last confirmed 14 days ago
13 more retailers have this diamond
Prices start from $382 USDSave up to $781 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
$382 USD