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Round|Natural|GIA

1.00ct H SI2 Round Natural Diamond

EX • H/SI2 • GIA 5553042899

Certificate GIA 5553042899

Diamond specifications and retailer prices

From £1,234 GBP
As of November 5, 2026
Save £1,696 GBP (58%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £3,595 GBP at NZ Jewellers · As of October 20, 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 5553042899. Listed at 19 retailers as of November 2, 2026, with a 137% 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

1.00
Carat
H
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 5553042899
Dimensions6.33 × 6.36 × 4.00 mm
L/W Ratio1.00
Top View
6.33 mm6.36 mm1.00 ctH / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5553042899
Side View
Table 59.0%Crown 35°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 63.0%

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 5
Current: £3,595 GBP|Low: £1,234 GBP|High: £3,595 GBP|Avg: £1,839 GBP|+0.8%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
Retailer 18
November 6, 2026
Retailer 15£1,234 GBP
Retailer 17£1,274 GBP
Retailer 5£1,369 GBP
Retailer 3£1,398 GBP
Retailer 18£1,418 GBP
Retailer 14£1,553 GBP
Retailer 2£1,556 GBP
Retailer 10£1,557 GBP
Retailer 8£1,629 GBP
Retailer 4£1,761 GBP
Retailer 6£1,761 GBP
Retailer 9£1,797 GBP
Retailer 11£1,806 GBP
Retailer 7£1,820 GBP
Retailer 16£2,041 GBP
Retailer 12£2,129 GBP
Retailer 13£2,930 GBP
NZ Jewellers£3,595 GBP

26 data points across 18 retailers

19 retailers£1,234 GBP to £2,930 GBP

A
Cheapest Retailer
-
£1,234 GBP
A
Retailer 2
-
£1,274 GBP
View
A
Retailer 3
-
£1,369 GBP
View
A
Retailer 4
-
£1,398 GBP
View
Final sale: no returns
A
Retailer 5
-
£1,418 GBP
View
Retailer 6
-
£1,545 GBP
View
Price last confirmed 21 days ago
A
Retailer 7
-
£1,553 GBP
View
A
Retailer 8
-
£1,556 GBP
View
Retailer 9
-
£1,557 GBP
View
Price last confirmed 15 days ago
Retailer 10
-
£1,629 GBP
View
Price last confirmed 15 days ago
A
Retailer 11
-
£1,761 GBP
View
A
Retailer 12
-
£1,761 GBP
View
Retailer 13
-
£1,797 GBP
View
Price last confirmed 16 days ago
B+
Retailer 14
-
£1,806 GBP
View
B+
Retailer 15
-
£1,820 GBP
View
B+
Retailer 16
-
£2,041 GBP
View
B+
Retailer 17
-
£2,129 GBP
View
B
Retailer 18
-
£2,930 GBP
View
Most Expensive
NZ Jewellers
83c0332c-7649-483a-b899-540f4f630fff · Oct 20
£3,595 GBP
$4,838 USD
View
Price last confirmed 17 days ago
18 more retailers have this diamond
Prices start from £1,234 GBPSave up to £1,696 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
£1,234 GBP