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Round|Natural|GIA

1.20ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 2556151106

Certificate GIA 2556151106

Diamond specifications and retailer prices

From £1,482 GBP
As of November 6, 2026
Save £1,928 GBP (57%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £4,208 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 SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2556151106. Listed at 19 retailers as of November 4, 2026, with a 130% 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
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 2556151106
Dimensions6.74 × 6.79 × 4.26 mm
L/W Ratio1.01
Top View
6.74 mm6.79 mm1.20 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2556151106
Side View
Table 57.0%Crown 36.5°Girdle: THN-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: £4,208 GBP|Low: £1,473 GBP|High: £4,222 GBP|Avg: £2,290 GBP|+3.0%
Queensmith
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 3£1,482 GBP
Retailer 2£1,544 GBP
Retailer 8£1,729 GBP
Retailer 12£1,801 GBP
Retailer 4£1,972 GBP
Retailer 11£1,995 GBP
Retailer 6£2,053 GBP
Retailer 10£2,057 GBP
Retailer 5£2,062 GBP
Retailer 7£2,418 GBP
Retailer 9£3,411 GBP
Queensmith£4,208 GBP

36 data points across 12 retailers

19 retailers£1,482 GBP to £3,411 GBP

A
Cheapest Retailer
-
£1,482 GBP
A
Retailer 2
-
£1,544 GBP
View
A
Retailer 3
-
£1,729 GBP
View
A
Retailer 4
-
£1,801 GBP
View
Final sale: no returns
A
Retailer 5
-
£1,836 GBP
View
Retailer 6
-
£1,972 GBP
View
Price last confirmed 39 days ago
Retailer 7
-
£1,972 GBP
View
Price last confirmed 21 days ago
Retailer 8
-
£1,972 GBP
View
Price last confirmed 17 days ago
A
Retailer 9
-
£1,995 GBP
View
Retailer 10
-
£2,048 GBP
View
Price last confirmed 38 days ago
A
Retailer 11
-
£2,053 GBP
View
B+
Retailer 12
-
£2,057 GBP
View
B+
Retailer 13
-
£2,062 GBP
View
Retailer 14
-
£2,276 GBP
View
Price last confirmed 38 days ago
B+
Retailer 15
-
£2,418 GBP
View
B
Retailer 16
-
£3,411 GBP
View
Retailer 17
-
£4,123 GBP
View
Price last confirmed 20 days ago
Retailer 18
-
£4,123 GBP
View
Price last confirmed 39 days ago
Most Expensive
Queensmith
2556151106 · Oct 28
£4,208 GBP
View
Price last confirmed 9 days ago
18 more retailers have this diamond
Prices start from £1,482 GBPSave up to £1,928 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
£1,482 GBP