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Round|Natural|GIA

1.20ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 1557218523

Certificate GIA 1557218523

Diamond specifications and retailer prices

From £1,473 GBP
As of November 6, 2026
Save £1,945 GBP (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £4,090 GBP at NZ Jewellers · As of October 3, 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 1557218523. Listed at 20 retailers as of November 4, 2026, with a 132% 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
FluorescenceFaint
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1557218523
Dimensions6.77 × 6.80 × 4.26 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Cloud, Cavity, Indented Natural
Top View
6.77 mm6.80 mm1.20 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1557218523
Side View
Table 57.0%Crown 36°Girdle: THN-MEDPavilion 41°Culet: NoneDepth 62.8%

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 6
Current: £2,438 GBP|Low: £1,473 GBP|High: £3,464 GBP|Avg: £2,153 GBP|+0.2%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 6, 2026
Retailer 9£1,473 GBP
Retailer 2£1,526 GBP
Retailer 7£1,715 GBP
Retailer 3£1,872 GBP
Retailer 4£2,046 GBP
Retailer 5£2,058 GBP
Retailer 6£2,388 GBP
Retailer 1£2,438 GBP
Retailer 8£3,418 GBP

27 data points across 9 retailers

20 retailers£1,473 GBP to £3,418 GBP

A
Cheapest Retailer
-
£1,473 GBP
A
Retailer 2
-
£1,526 GBP
View
B+
Retailer 3
-
£1,715 GBP
View
B+
Retailer 4
-
£1,821 GBP
View
B+
Retailer 5
-
£1,823 GBP
View
B+
Retailer 6
-
£1,823 GBP
View
B+
Retailer 7
-
£1,872 GBP
View
Retailer 8
-
£1,956 GBP
View
Price last confirmed 39 days ago
Retailer 9
-
£1,956 GBP
View
Price last confirmed 25 days ago
B+
Retailer 10
-
£2,002 GBP
View
Retailer 11
-
£2,031 GBP
View
Price last confirmed 38 days ago
B
Retailer 12
-
£2,046 GBP
View
B+
Retailer 13
-
£2,058 GBP
View
B
Retailer 14
-
£2,061 GBP
View
Retailer 15
-
£2,257 GBP
View
Price last confirmed 38 days ago
B
Retailer 16
-
£2,388 GBP
View
B
Retailer 17
-
£2,438 GBP
View
B
Retailer 18
-
£3,418 GBP
View
Retailer 19
-
£4,090 GBP
View
Price last confirmed 39 days ago
Most Expensive
NZ Jewellers
91146f89-0f16-4898-9c1f-0dc4da1ab6cd · Oct 3
£4,090 GBP
$5,474 USD
View
Price last confirmed 34 days ago
19 more retailers have this diamond
Prices start from £1,473 GBPSave up to £1,945 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
£1,473 GBP