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Round|Natural|GIA

1.20ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 1439457358

Certificate GIA 1439457358

Diamond specifications and retailer prices

From £1,878 GBP
As of November 4, 2026
Save £3,800 GBP (67%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £5,678 GBP at Diamond Quarter · As of November 5, 2026
View at Diamond Quarter

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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1439457358. Listed at 21 retailers as of November 4, 2026, with prices from £1,878 to £5,678, a £3,800 spread on the same certified stone. Diamond Quarter lists it at £5,678. 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle35°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 1439457358
Dimensions6.79 × 6.75 × 4.25 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Culet sizeNone
Top View
6.79 mm6.75 mm1.20 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 1439457358
Side View
Table 56.0%Crown 35°Girdle: MED-STKPavilion 41°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 4
Current: £2,670 GBP|Low: £1,706 GBP|High: £4,142 GBP|Avg: £2,457 GBP|+1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 5, 2026
Retailer 6£1,921 GBP
Retailer 9£1,921 GBP
Retailer 7£2,047 GBP
Retailer 3£2,217 GBP
Retailer 10£2,265 GBP
Retailer 8£2,303 GBP
Retailer 11£2,407 GBP
Retailer 4£2,518 GBP
Retailer 2£2,558 GBP
Retailer 1£2,670 GBP
Retailer 5£4,082 GBP

41 data points across 11 retailers

21 retailers£1,878 GBP to £5,678 GBP

A
Cheapest Retailer
-
£1,878 GBP
A
Retailer 2
-
£1,921 GBP
View
A
Retailer 3
-
£1,921 GBP
View
A
Retailer 4
-
£1,928 GBP
View
A
Retailer 5
-
£2,047 GBP
View
Final sale: no returns
A
Retailer 6
-
£2,047 GBP
View
Retailer 7
-
£2,217 GBP
View
Price last confirmed 8 days ago
B+
Retailer 8
-
£2,217 GBP
View
B+
Retailer 9
-
£2,265 GBP
View
B+
Retailer 10
-
£2,303 GBP
View
B+
Retailer 11
-
£2,407 GBP
View
B+
Retailer 12
-
£2,518 GBP
View
B+
Retailer 13
-
£2,519 GBP
View
B+
Retailer 14
-
£2,519 GBP
View
B+
Retailer 15
-
£2,558 GBP
View
B+
Retailer 16
-
£2,608 GBP
View
B+
Retailer 17
-
£2,670 GBP
View
Retailer 18
-
£2,838 GBP
View
Price last confirmed 14 days ago
B
Retailer 19
-
£4,082 GBP
View
B
Retailer 20
-
£4,264 GBP
View
Most Expensive
B
Diamond Quarter
1.2SI2H14589FD0N · Nov 5
£5,678 GBP
View
20 more retailers have this diamond
Prices start from £1,878 GBPSave up to £3,800 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
£1,878 GBP