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Round|Natural|GIA

1.00ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 3455453944

Certificate GIA 3455453944

Diamond specifications and retailer prices

From £1,678 GBP
As of November 6, 2026
Save £2,836 GBP (63%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £4,514 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct 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 3455453944. Listed at 22 retailers as of November 5, 2026, with prices from £1,678 to £4,514, a £2,836 spread on the same certified stone. NZ Jewellers lists it at £4,514. 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

1.00
Carat
H
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
Crown angle36.5°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 3455453944
Dimensions6.38 × 6.32 × 3.99 mm
L/W Ratio1.01
Star length50%
Lower girdle80%
Top View
6.38 mm6.32 mm1.00 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceFaint
CertificateGIA 3455453944
Side View
Table 55.0%Crown 36.5°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 63.2%

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: £2,009 GBP|Low: £1,557 GBP|High: £3,654 GBP|Avg: £2,222 GBP|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 8£1,678 GBP
Retailer 4£1,690 GBP
Retailer 6£1,805 GBP
Retailer 1£2,009 GBP
Retailer 7£2,031 GBP
Retailer 2£2,272 GBP
Retailer 3£2,356 GBP
Retailer 5£3,611 GBP

43 data points across 8 retailers

22 retailers£1,678 GBP to £4,514 GBP

Retailer 1
-
£1,609 GBP
Price last confirmed 26 days ago
A
Retailer 2
-
£1,678 GBP
View
A
Retailer 3
-
£1,690 GBP
View
A
Retailer 4
-
£1,716 GBP
View
B+
Retailer 5
-
£1,752 GBP
View
B+
Retailer 6
-
£1,805 GBP
View
Final sale: no returns
B+
Retailer 7
-
£1,815 GBP
View
Retailer 8
-
£1,956 GBP
View
Price last confirmed 8 days ago
B+
Retailer 9
-
£1,956 GBP
View
B+
Retailer 10
-
£1,985 GBP
View
B+
Retailer 11
-
£2,009 GBP
View
B+
Retailer 12
-
£2,031 GBP
View
B
Retailer 13
-
£2,236 GBP
View
B
Retailer 14
-
£2,236 GBP
View
B
Retailer 15
-
£2,257 GBP
View
B+
Retailer 16
-
£2,272 GBP
View
B
Retailer 17
-
£2,311 GBP
View
B+
Retailer 18
-
£2,356 GBP
View
Retailer 19
-
£2,508 GBP
View
Price last confirmed 14 days ago
B
Retailer 20
-
£3,611 GBP
View
B
Retailer 21
-
£4,436 GBP
View
Most Expensive
B
NZ Jewellers
bcb0ac1b-07bb-4a7d-b9c3-dcd4980bfa5b · Nov 5
£4,514 GBP
$6,076 USD
View
21 more retailers have this diamond
Prices start from £1,678 GBPSave up to £2,836 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
1.00ct Round
£1,678 GBP