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1.20ct D SI1 Round Natural Diamond

EX • D/SI1 • GIA 3555551384

Certificate GIA 3555551384

Diamond specifications and retailer prices

From £1,855 GBP
As of November 6, 2026
Save £2,567 GBP (58%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £4,422 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

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 3555551384. Listed at 9 retailers as of November 5, 2026, with prices from £1,855 to £4,422, a £2,567 spread on the same certified stone. NZ Jewellers lists it at £4,422. 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 angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 3555551384
Dimensions6.68 × 6.73 × 4.26 mm
L/W Ratio1.01
Key to symbols
Crystal, Cloud, Feather, Needle, Indented Natural, Natural
Top View
6.68 mm6.73 mm1.20 ctD / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 3555551384
Side View
Table 58.0%CrownGirdle: Slightly ThickPavilion 41.6°Culet: NoneDepth 63.5%

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: £4,422 GBP|Low: £1,855 GBP|High: £4,706 GBP|Avg: £2,994 GBP|-6.0%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 2£1,855 GBP
Retailer 5£2,201 GBP
Retailer 9£2,264 GBP
Retailer 8£2,538 GBP
Retailer 3£2,573 GBP
Retailer 7£2,635 GBP
Retailer 6£2,959 GBP
Retailer 4£4,233 GBP
NZ Jewellers£4,422 GBP

41 data points across 9 retailers

9 retailers£1,855 GBP to £4,422 GBP

A
Cheapest Retailer
-
£1,855 GBP
A
Retailer 2
-
£2,201 GBP
View
A
Retailer 3
-
£2,264 GBP
View
A
Retailer 4
-
£2,538 GBP
View
A
Retailer 5
-
£2,573 GBP
View
A
Retailer 6
-
£2,635 GBP
View
B+
Retailer 7
-
£2,959 GBP
View
B+
Retailer 8
-
£4,233 GBP
View
Most Expensive
B
NZ Jewellers
b7335a54-dc7a-46d8-b154-9af7e0d6ced2 · Nov 5
£4,422 GBP
$5,951 USD
View
8 more retailers have this diamond
Prices start from £1,855 GBPSave up to £2,567 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
£1,855 GBP