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Round|Natural|GIA

1.20ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 5566279707

Certificate GIA 5566279707

Diamond specifications and retailer prices

From £1,865 GBP
As of November 6, 2026
Save £2,281 GBP (55%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £4,626 GBP at Queensmith · As of October 28, 2026
View at Queensmith

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 5566279707. Listed at 22 retailers as of November 2, 2026, with a 122% 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
SymmetryVery Good
FluorescenceFaint
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 5566279707
Dimensions6.75 × 6.70 × 4.23 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle, Indented Natural, Natural, Extra Facet
Top View
6.75 mm6.70 mm1.20 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 5566279707
Side View
Table 59.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.9%

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: £4,626 GBP|Low: £1,865 GBP|High: £4,640 GBP|Avg: £2,936 GBP|+2.7%
Queensmith
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 9£1,865 GBP
Retailer 3£1,938 GBP
Retailer 7£2,179 GBP
Retailer 10£2,294 GBP
Retailer 4£2,372 GBP
Retailer 5£2,534 GBP
Retailer 2£2,897 GBP
Retailer 6£3,026 GBP
Retailer 8£4,146 GBP
Queensmith£4,626 GBP

24 data points across 10 retailers

22 retailers£1,865 GBP to £4,146 GBP

A
Cheapest Retailer
-
£1,865 GBP
A
Retailer 2
-
£1,938 GBP
View
A
Retailer 3
-
£2,179 GBP
View
B+
Retailer 4
-
£2,220 GBP
View
B+
Retailer 5
-
£2,288 GBP
View
Final sale: no returns
B+
Retailer 6
-
£2,294 GBP
View
B+
Retailer 7
-
£2,294 GBP
View
B+
Retailer 8
-
£2,372 GBP
View
Retailer 9
-
£2,480 GBP
View
Price last confirmed 19 days ago
Retailer 10
-
£2,480 GBP
View
Price last confirmed 25 days ago
B+
Retailer 11
-
£2,503 GBP
View
B+
Retailer 12
-
£2,534 GBP
View
Retailer 13
-
£2,575 GBP
View
Price last confirmed 22 days ago
B+
Retailer 14
-
£2,586 GBP
View
B+
Retailer 15
-
£2,598 GBP
View
Retailer 16
-
£2,658 GBP
View
Price last confirmed 33 days ago
Retailer 17
-
£2,861 GBP
View
Price last confirmed 19 days ago
B
Retailer 18
-
£2,897 GBP
View
B+
Retailer 19
-
£3,026 GBP
View
B
Retailer 20
-
£4,146 GBP
View
Retailer 21
-
£4,320 GBP
View
Price last confirmed 20 days ago
Most Expensive
Queensmith
5566279707 · Oct 28
£4,626 GBP
View
Price last confirmed 9 days ago
21 more retailers have this diamond
Prices start from £1,865 GBPSave up to £2,281 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
£1,865 GBP