Round|Natural|GIA

0.51ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 7426956403

Certificate GIA 7426956403

Diamond specifications and retailer prices

From $841 USD
As of November 4, 2026
Save $999 USD (54%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,840 USD at MOH London · As of November 4, 2026
View at MOH London

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 7426956403. Listed at 12 retailers as of November 4, 2026, with prices from $841 to $1,840, a $999 spread on the same certified stone. MOH London lists it at $1,840. 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
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle34°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 7426956403
Dimensions5.18 × 5.14 × 3.16 mm
L/W Ratio1.01
Top View
5.18 mm5.14 mm0.51 ctI / SI2
OriginNatural
CutExcellent
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 7426956403
Side View
Table 56.0%Crown 34°Girdle: MediumPavilion 41.2°Culet: NoneDepth 61.3%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $1,840 USD|Low: $719 USD|High: $1,866 USD|Avg: $1,209 USD|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 5, 2026
Retailer 6$841 USD
Retailer 5$850 USD
Retailer 4$931 USD
Retailer 7$947 USD
Retailer 3$1,172 USD
Retailer 2$1,309 USD
MOH London$1,840 USD

42 data points across 7 retailers

12 retailers$841 USD to $1,840 USD

B+
Cheapest Retailer
-
$841 USD
Final sale: no returns
B+
Retailer 2
-
$850 USD
View
B+
Retailer 3
-
$931 USD
View
B+
Retailer 4
-
$947 USD
View
Retailer 5
-
$1,052 USD
View
Price last confirmed 10 days ago
B
Retailer 6
-
$1,120 USD
View
B
Retailer 7
-
$1,120 USD
View
B
Retailer 8
-
$1,160 USD
View
B
Retailer 9
-
$1,172 USD
View
B
Retailer 10
-
$1,309 USD
View
Most Expensive
B
MOH London
F91F95726 · Nov 4
$1,840 USD
£1,449 GBP
View
10 more retailers have this diamond
Prices start from $841 USDSave up to $999 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.

B+
0.51ct Round
$841 USD