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1.20ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 1242104470

Certificate GIA 1242104470

Diamond specifications and retailer prices

From £2,358 GBP
As of November 6, 2026
Save £2,777 GBP (54%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £5,135 GBP at MOH London · As of November 1, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1242104470. Listed at 7 retailers as of November 1, 2026, with prices from £2,358 to £5,135, a £2,777 spread on the same certified stone. MOH London lists it at £5,135. 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
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1242104470
Dimensions6.71 × 6.76 × 4.21 mm
L/W Ratio1.01
Key to symbols
Crystal, Pinpoint
Top View
6.71 mm6.76 mm1.20 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1242104470
Side View
Table 59.0%CrownGirdle: 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: £5,135 GBP|Low: £2,358 GBP|High: £5,135 GBP|Avg: £3,187 GBP
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 6, 2026
Retailer 5£2,358 GBP
Retailer 4£2,707 GBP
Retailer 7£2,845 GBP
Retailer 3£2,975 GBP
Retailer 2£3,054 GBP
Retailer 6£3,548 GBP
MOH London£5,135 GBP

8 data points across 7 retailers

7 retailers£2,358 GBP to £5,135 GBP

A
Cheapest Retailer
-
£2,358 GBP
A
Retailer 2
-
£2,707 GBP
View
B+
Retailer 3
-
£2,845 GBP
View
B+
Retailer 4
-
£2,975 GBP
View
B+
Retailer 5
-
£3,054 GBP
View
B+
Retailer 6
-
£3,548 GBP
View
Most Expensive
B
MOH London
49913240E · Nov 1
£5,135 GBP
View
6 more retailers have this diamond
Prices start from £2,358 GBPSave up to £2,777 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
£2,358 GBP