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Round|Natural|GIA

1.20ct M SI1 Round Natural Diamond

EX • M/SI1 • GIA 6512270726

Certificate GIA 6512270726

Diamond specifications and retailer prices

From £960 GBP
As of November 6, 2026
Save £990 GBP (51%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £3,129 GBP at NZ Jewellers · As of October 23, 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 6512270726. Listed at 10 retailers as of November 4, 2026, with a 103% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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 angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 6512270726
Dimensions6.74 × 6.78 × 4.24 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
6.74 mm6.78 mm1.20 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6512270726
Side View
Table 59.0%Crown 35°Girdle: THN-STKPavilion 41.4°Culet: NoneDepth 62.7%

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: £3,129 GBP|Low: £960 GBP|High: £4,652 GBP|Avg: £1,867 GBP|-5.1%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 2£960 GBP
Retailer 7£1,092 GBP
Retailer 10£1,182 GBP
Retailer 9£1,245 GBP
Retailer 4£1,256 GBP
Retailer 11£1,418 GBP
Retailer 6£1,594 GBP
Retailer 5£1,706 GBP
Retailer 8£1,950 GBP
NZ Jewellers£3,129 GBP
Retailer 3£4,652 GBP

24 data points across 11 retailers

10 retailers£960 GBP to £1,950 GBP

A
Cheapest Retailer
-
£960 GBP
A
Retailer 2
-
£1,092 GBP
View
Final sale: no returns
B+
Retailer 3
-
£1,182 GBP
View
B+
Retailer 4
-
£1,245 GBP
View
B+
Retailer 5
-
£1,256 GBP
View
B+
Retailer 6
-
£1,418 GBP
View
B
Retailer 7
-
£1,594 GBP
View
B
Retailer 8
-
£1,706 GBP
View
B
Retailer 9
-
£1,950 GBP
View
Most Expensive
NZ Jewellers
bf1a6de8-6107-4d12-ae9c-81a5341c0c73 · Oct 23
£3,129 GBP
$4,211 USD
View
Price last confirmed 13 days ago
9 more retailers have this diamond
Prices start from £960 GBPSave up to £990 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
£960 GBP