Round|Natural|GIA

1.20ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6545442420

Certificate GIA 6545442420

Diamond specifications and retailer prices

From £1,520 GBP
As of November 6, 2026
Save £1,967 GBP (56%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £4,173 GBP at NZ Jewellers · As of September 28, 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 K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6545442420. Listed at 18 retailers as of November 4, 2026, with a 129% 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
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 6545442420
Dimensions6.79 × 6.84 × 4.23 mm
L/W Ratio1.01
Top View
6.79 mm6.84 mm1.20 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6545442420
Side View
Table 58.0%Crown 34°Girdle: MED-STKPavilion 41.6°Culet: NoneDepth 62.1%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £1,572 GBP|Low: £1,520 GBP|High: £3,539 GBP|Avg: £2,264 GBP|-2.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 8£1,520 GBP
Retailer 1£1,572 GBP
Retailer 5£1,769 GBP
Retailer 3£2,100 GBP
Retailer 2£2,109 GBP
Retailer 4£2,436 GBP
Retailer 6£2,476 GBP
Retailer 7£3,488 GBP

34 data points across 8 retailers

18 retailers£1,520 GBP to £3,488 GBP

A
Cheapest Retailer
-
£1,520 GBP
A
Retailer 2
-
£1,572 GBP
View
B+
Retailer 3
-
£1,769 GBP
View
B+
Retailer 4
-
£1,856 GBP
View
B+
Retailer 5
-
£1,878 GBP
View
B+
Retailer 6
-
£1,879 GBP
View
Retailer 7
-
£1,996 GBP
View
Price last confirmed 39 days ago
Retailer 8
-
£1,996 GBP
View
Price last confirmed 25 days ago
B
Retailer 9
-
£2,040 GBP
View
Retailer 10
-
£2,073 GBP
View
Price last confirmed 38 days ago
B+
Retailer 11
-
£2,100 GBP
View
B
Retailer 12
-
£2,101 GBP
View
B
Retailer 13
-
£2,109 GBP
View
Retailer 14
-
£2,303 GBP
View
Price last confirmed 38 days ago
B
Retailer 15
-
£2,436 GBP
View
B
Retailer 16
-
£2,476 GBP
View
B
Retailer 17
-
£3,488 GBP
View
Most Expensive
NZ Jewellers
fb4b624f-56ed-4d45-9c91-33d05b7f11c1 · Sep 28
£4,173 GBP
$5,586 USD
View
Price last confirmed 39 days ago
17 more retailers have this diamond
Prices start from £1,520 GBPSave up to £1,967 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
£1,520 GBP