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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 €1,819 EUR
As of November 6, 2026
Save €2,626 EUR (59%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: €4,445 EUR 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 €1,819 to €4,445, a €2,626 spread on the same certified stone. MOH London lists it at €4,445. 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
Colour
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: €4,445 EUR|Low: €1,819 EUR|High: €4,482 EUR|Avg: €2,807 EUR|-0.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 4€1,819 EUR
Retailer 3€2,058 EUR
Retailer 2€2,188 EUR
Retailer 5€2,338 EUR
Retailer 10€2,494 EUR
Retailer 6€2,569 EUR
Retailer 7€2,570 EUR
Retailer 8€2,849 EUR
Retailer 9€3,105 EUR
MOH London€4,445 EUR

27 data points across 10 retailers

12 retailers€1,819 EUR to €4,445 EUR

A
Cheapest Retailer
-
€1,819 EUR
A
Retailer 2
-
€2,058 EUR
View
A
Retailer 3
-
€2,188 EUR
View
A
Retailer 4
-
€2,338 EUR
View
B+
Retailer 5
-
€2,494 EUR
View
B+
Retailer 6
-
€2,569 EUR
View
A
Retailer 7
-
€2,570 EUR
View
B+
Retailer 8
-
€2,588 EUR
View
B+
Retailer 9
-
€2,849 EUR
View
Retailer 10
-
€2,850 EUR
View
Price last confirmed 30 days ago
B+
Retailer 11
-
€3,105 EUR
View
Most Expensive
B
MOH London
299C4EEEE · Nov 4
€4,445 EUR
£3,908 GBP
View
11 more retailers have this diamond
Prices start from €1,819 EURSave up to €2,626 EUR

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
€1,819 EUR