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Round|Natural|GIA

1.20ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2566304544

Certificate GIA 2566304544

Diamond specifications and retailer prices

From $2,031 USD
As of November 6, 2026
Save $2,932 USD (59%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $4,963 USD at MOH London · As of November 4, 2026
View at MOH London

About this 1.2ct natural round diamond

This 1.2ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2566304544. Listed at 12 retailers as of November 4, 2026, with prices from $2,031 to $4,963, a $2,932 spread on the same certified stone. MOH London lists it at $4,963. 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

1.20
Carat
I
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 2566304544
Dimensions6.73 × 6.78 × 4.25 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Feather, Cavity
Top View
6.73 mm6.78 mm1.20 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2566304544
Side View
Table 56.0%Crown 35.5°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.9%

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: $4,963 USD|Low: $2,031 USD|High: $5,037 USD|Avg: $3,198 USD|-1.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 2$2,031 USD
Retailer 3$2,610 USD
Retailer 8$2,785 USD
Retailer 4$2,868 USD
Retailer 5$2,869 USD
Retailer 6$3,181 USD
Retailer 7$3,467 USD
MOH London$4,963 USD

28 data points across 8 retailers

12 retailers$2,031 USD to $4,963 USD

A
Cheapest Retailer
-
$2,031 USD
A
Retailer 2
-
$2,389 USD
View
A
Retailer 3
-
$2,544 USD
View
A
Retailer 4
-
$2,610 USD
View
B+
Retailer 5
-
$2,785 USD
View
B+
Retailer 6
-
$2,868 USD
View
A
Retailer 7
-
$2,869 USD
View
B+
Retailer 8
-
$2,890 USD
View
B+
Retailer 9
-
$3,181 USD
View
Retailer 10
-
$3,182 USD
View
Price last confirmed 30 days ago
B+
Retailer 11
-
$3,467 USD
View
Most Expensive
B
MOH London
299C4EEEE · Nov 4
$4,963 USD
£3,908 GBP
View
11 more retailers have this diamond
Prices start from $2,031 USDSave up to $2,932 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
1.20ct Round
$2,031 USD