Round|Natural|GIA

1.20ct M SI1 Round Natural Diamond

EX • M/SI1 • GIA 1569139099

Certificate GIA 1569139099

Diamond specifications and retailer prices

From £1,251 GBP
As of November 4, 2026
Save £587 GBP (32%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £3,405 GBP at NZ Jewellers · As of October 11, 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 1569139099. Listed at 11 retailers as of November 3, 2026, with a 47% 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
FluorescenceNone
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 1569139099
Dimensions6.73 × 6.77 × 4.20 mm
L/W Ratio1.01
Culet sizeNone
Key to symbols
Feather, Needle, Cloud
Top View
6.73 mm6.77 mm1.20 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1569139099
Side View
Table 58.0%Crown 36°GirdlePavilion 40.6°Culet: NoneDepth 62.1%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £1,328 GBP|Low: £1,251 GBP|High: £1,961 GBP|Avg: £1,549 GBP|-8.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 6, 2026
Retailer 6£1,251 GBP
Retailer 1£1,328 GBP
Retailer 4£1,393 GBP
Retailer 3£1,452 GBP
Retailer 5£1,658 GBP
Retailer 2£1,838 GBP

36 data points across 6 retailers

11 retailers£1,251 GBP to £1,838 GBP

B+
Cheapest Retailer
-
£1,251 GBP
B+
Retailer 2
-
£1,328 GBP
View
B+
Retailer 3
-
£1,393 GBP
View
Retailer 4
-
£1,396 GBP
View
Price last confirmed 25 days ago
Retailer 5
-
£1,396 GBP
View
Price last confirmed 25 days ago
B+
Retailer 6
-
£1,452 GBP
View
Retailer 7
-
£1,484 GBP
View
Price last confirmed 38 days ago
Retailer 8
-
£1,611 GBP
View
Price last confirmed 25 days ago
Retailer 9
-
£1,658 GBP
View
Price last confirmed 11 days ago
B
Retailer 10
-
£1,838 GBP
View
Most Expensive
NZ Jewellers
c2482e4e-3761-4df1-ada2-f02b805ae319 · Oct 11
£3,405 GBP
$4,583 USD
View
Price last confirmed 26 days ago
10 more retailers have this diamond
Prices start from £1,251 GBPSave up to £587 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.

B+
1.20ct Round
£1,251 GBP