Round|Natural|GIA

0.51ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 1535044773

Certificate GIA 1535044773

Diamond specifications and retailer prices

From $406 USD
As of November 6, 2026
Save $910 USD (69%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $1,791 USD at NZ Jewellers · As of October 27, 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 1535044773. Listed at 15 retailers as of November 4, 2026, with a 224% 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
FluorescenceMedium
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1535044773
Dimensions5.11 × 5.09 × 3.19 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Culet sizeNone
Key to symbols
Cloud
Top View
5.11 mm5.09 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1535044773
Side View
Table 57.0%Crown 35.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.6%

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: $406 USD|Low: $406 USD|High: $1,334 USD|Avg: $709 USD|-2.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 1$406 USD
Retailer 9$527 USD
Retailer 6$575 USD
Retailer 3$586 USD
Retailer 8$659 USD
Retailer 2$678 USD
Retailer 4$689 USD
Retailer 5$744 USD
Retailer 7$1,316 USD

29 data points across 9 retailers

15 retailers$406 USD to $1,316 USD

A
Cheapest Retailer
-
$406 USD
A
Retailer 2
-
$473 USD
View
A
Retailer 3
-
$527 USD
View
Final sale: no returns
A
Retailer 4
-
$575 USD
View
A
Retailer 5
-
$586 USD
View
A
Retailer 6
-
$615 USD
View
Retailer 7
-
$659 USD
View
Price last confirmed 10 days ago
B+
Retailer 8
-
$659 USD
View
B+
Retailer 9
-
$678 USD
View
B+
Retailer 10
-
$681 USD
View
B+
Retailer 11
-
$689 USD
View
B+
Retailer 12
-
$744 USD
View
B
Retailer 13
-
$884 USD
View
B
Retailer 14
-
$1,316 USD
View
Most Expensive
NZ Jewellers
fb916022-03e4-4531-afed-4b3324334911 · Oct 27
$1,791 USD
View
Price last confirmed 10 days ago
14 more retailers have this diamond
Prices start from $406 USDSave up to $910 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
$406 USD