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Round|Natural|IGI

1.20ct M SI1 Round Natural Diamond

EX • M/SI1 • IGI 425073127

Shape and cutting style on the report: Round brilliant

Certificate IGI 425073127

Diamond specifications and retailer prices

From £648 GBP
As of November 5, 2026
Save £1,360 GBP (68%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £2,008 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 IGI 425073127. Listed at 14 retailers as of November 5, 2026, with prices from £648 to £2,008, a £1,360 spread on the same certified stone. NZ Jewellers lists it at £2,008. 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
FluorescenceNone
Crown angle35.7°
Pavilion angle40°
OriginNatural
Grading LabIGI
CertificateIGI 425073127
Dimensions6.76 × 6.80 × 4.19 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
6.76 mm6.80 mm1.20 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI 425073127
Side View
Table 54.5%Crown 35.7°Girdle: MED-STKPavilion 40°Culet: NoneDepth 61.8%

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 5
Current: £2,008 GBP|Low: £648 GBP|High: £2,008 GBP|Avg: £986 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
November 6, 2026
Retailer 8£648 GBP
Retailer 3£788 GBP
Retailer 2£809 GBP
Retailer 5£823 GBP
Retailer 12£823 GBP
Retailer 6£855 GBP
Retailer 4£923 GBP
Retailer 13£925 GBP
Retailer 11£950 GBP
Retailer 10£956 GBP
Retailer 9£1,005 GBP
Retailer 7£1,118 GBP
Retailer 14£1,233 GBP
NZ Jewellers£2,008 GBP

38 data points across 14 retailers

14 retailers£648 GBP to £2,008 GBP

A
Cheapest Retailer
-
£648 GBP
B+
Retailer 2
-
£788 GBP
View
A
Retailer 3
-
£809 GBP
View
Retailer 4
-
£823 GBP
View
Price last confirmed 12 days ago
B+
Retailer 5
-
£823 GBP
View
B+
Retailer 6
-
£855 GBP
View
B+
Retailer 7
-
£923 GBP
View
B+
Retailer 8
-
£925 GBP
View
B+
Retailer 9
-
£950 GBP
View
B+
Retailer 10
-
£956 GBP
View
B+
Retailer 11
-
£1,005 GBP
View
B+
Retailer 12
-
£1,118 GBP
View
B+
Retailer 13
-
£1,233 GBP
View
Most Expensive
B
NZ Jewellers
8721241d-33f3-4f5b-921a-9a0e1ce9782c · Nov 5
£2,008 GBP
$2,703 USD
View
13 more retailers have this diamond
Prices start from £648 GBPSave up to £1,360 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
£648 GBP