Round|Natural|GIA

1.20ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 1548587129

Certificate GIA 1548587129

Diamond specifications and retailer prices

From £2,211 GBP
As of November 4, 2026
Save £1,947 GBP (47%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £5,014 GBP at NZ Jewellers · As of October 20, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1548587129. Listed at 22 retailers as of November 4, 2026, with a 88% 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1548587129
Dimensions6.78 × 6.75 × 4.22 mm
L/W Ratio1.00
Girdle conditionSlightly Thick
Key to symbols
Crystal, Feather, Needle
Top View
6.78 mm6.75 mm1.20 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceMedium
CertificateGIA 1548587129
Side View
Table 58.0%Crown 35.5°Girdle: Slightly ThickPavilion 41°Culet: NoneDepth 62.4%

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: £3,251 GBP|Low: £2,211 GBP|High: £4,870 GBP|Avg: £3,065 GBP|+13.9%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 3£2,211 GBP
Retailer 8£2,227 GBP
Retailer 7£2,287 GBP
Retailer 6£3,082 GBP
Retailer 2£3,146 GBP
Retailer 1£3,251 GBP
Retailer 5£3,493 GBP
Retailer 4£4,838 GBP

42 data points across 8 retailers

22 retailers£2,211 GBP to £4,158 GBP

B+
Cheapest Retailer
-
£2,211 GBP
B+
Retailer 2
-
£2,227 GBP
View
B+
Retailer 3
-
£2,249 GBP
View
B+
Retailer 4
-
£2,287 GBP
View
Final sale: no returns
Retailer 5
-
£2,314 GBP
View
Price last confirmed 17 days ago
B+
Retailer 6
-
£2,476 GBP
View
Retailer 7
-
£2,510 GBP
View
Price last confirmed 15 days ago
Retailer 8
-
£2,607 GBP
View
Price last confirmed 21 days ago
Retailer 9
-
£2,607 GBP
View
Price last confirmed 17 days ago
Retailer 10
-
£2,708 GBP
View
Price last confirmed 22 days ago
B
Retailer 11
-
£2,835 GBP
View
B
Retailer 12
-
£2,835 GBP
View
Retailer 13
-
£3,008 GBP
View
Price last confirmed 16 days ago
Retailer 14
-
£3,082 GBP
View
Price last confirmed 29 days ago
B+
Retailer 15
-
£3,146 GBP
View
B
Retailer 16
-
£3,251 GBP
View
Retailer 17
-
£3,257 GBP
View
Price last confirmed 22 days ago
B
Retailer 18
-
£3,383 GBP
View
Retailer 19
-
£3,493 GBP
View
Price last confirmed 20 days ago
B
Retailer 20
-
£4,158 GBP
View
Retailer 21
-
£4,838 GBP
View
Price last confirmed 16 days ago
Most Expensive
NZ Jewellers
0a40bb14-684d-41c6-873e-4e48ee2e3721 · Oct 20
£5,014 GBP
$6,711 USD
View
Price last confirmed 17 days ago
21 more retailers have this diamond
Prices start from £2,211 GBPSave up to £1,947 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
£2,211 GBP