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Round|Natural|GIA

1.20ct M SI1 Round Natural Diamond

EX • M/SI1 • GIA 6555412535

Certificate GIA 6555412535

Diamond specifications and retailer prices

From £1,147 GBP
As of November 6, 2026
Save £1,699 GBP (60%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £2,846 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 M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6555412535. Listed at 9 retailers as of November 5, 2026, with prices from £1,147 to £2,846, a £1,699 spread on the same certified stone. NZ Jewellers lists it at £2,846. 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
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6555412535
Dimensions6.71 × 6.76 × 4.20 mm
L/W Ratio1.01
Star length45%
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Cloud, Crystal, Cavity, Feather, Needle, Natural
Top View
6.71 mm6.76 mm1.20 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6555412535
Side View
Table 58.0%Crown 36°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.4%

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: £2,846 GBP|Low: £1,146 GBP|High: £2,846 GBP|Avg: £1,478 GBP|+0.5%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 2£1,147 GBP
Retailer 5£1,167 GBP
Retailer 7£1,167 GBP
Retailer 8£1,221 GBP
Retailer 9£1,230 GBP
Retailer 6£1,346 GBP
Retailer 4£1,424 GBP
Retailer 3£1,581 GBP
NZ Jewellers£2,846 GBP

40 data points across 9 retailers

9 retailers£1,147 GBP to £2,846 GBP

A
Cheapest Retailer
-
£1,147 GBP
A
Retailer 2
-
£1,167 GBP
View
Retailer 3
-
£1,167 GBP
View
Price last confirmed 8 days ago
B+
Retailer 4
-
£1,221 GBP
View
B+
Retailer 5
-
£1,230 GBP
View
B+
Retailer 6
-
£1,346 GBP
View
B+
Retailer 7
-
£1,424 GBP
View
B+
Retailer 8
-
£1,581 GBP
View
Most Expensive
C
NZ Jewellers
54b1ff15-49cf-4bc5-b5df-5bc48f4b0db9 · Nov 5
£2,846 GBP
$3,831 USD
View
8 more retailers have this diamond
Prices start from £1,147 GBPSave up to £1,699 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
£1,147 GBP