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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 £1,517 GBP
As of November 6, 2026
Save £2,191 GBP (59%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £3,708 GBP 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 £1,517 to £3,708, a £2,191 spread on the same certified stone. MOH London lists it at £3,708. 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: £3,708 GBP|Low: £1,517 GBP|High: £3,738 GBP|Avg: £2,341 GBP|-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£1,517 GBP
Retailer 3£1,717 GBP
Retailer 2£1,825 GBP
Retailer 5£1,950 GBP
Retailer 10£2,081 GBP
Retailer 6£2,143 GBP
Retailer 7£2,143 GBP
Retailer 8£2,377 GBP
Retailer 9£2,590 GBP
MOH London£3,708 GBP

27 data points across 10 retailers

12 retailers£1,517 GBP to £3,708 GBP

A
Cheapest Retailer
-
£1,517 GBP
A
Retailer 2
-
£1,717 GBP
View
A
Retailer 3
-
£1,825 GBP
View
A
Retailer 4
-
£1,950 GBP
View
B+
Retailer 5
-
£2,081 GBP
View
B+
Retailer 6
-
£2,143 GBP
View
A
Retailer 7
-
£2,143 GBP
View
B+
Retailer 8
-
£2,159 GBP
View
B+
Retailer 9
-
£2,377 GBP
View
Retailer 10
-
£2,377 GBP
View
Price last confirmed 30 days ago
B+
Retailer 11
-
£2,590 GBP
View
Most Expensive
B
MOH London
299C4EEEE · Nov 4
£3,708 GBP
View
11 more retailers have this diamond
Prices start from £1,517 GBPSave up to £2,191 GBP

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
£1,517 GBP