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Round|Natural|GIA

1.01ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 2566100127

Certificate GIA 2566100127

Diamond specifications and retailer prices

From £1,388 GBP
As of November 6, 2026
Save £2,507 GBP (64%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £4,078 GBP at NZ Jewellers · As of September 28, 2026
View at NZ Jewellers

About this 1.01ct natural round diamond

This 1.01ct 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 2566100127. Listed at 21 retailers as of November 5, 2026, with a 181% 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

1.01
Carat
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle35°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 2566100127
Dimensions6.35 × 6.40 × 4.00 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle, Natural
Top View
6.35 mm6.40 mm1.01 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2566100127
Side View
Table 59.0%Crown 35°Girdle: MED-STKPavilion 41.6°Culet: NoneDepth 62.8%

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: £3,895 GBP|Low: £1,388 GBP|High: £3,995 GBP|Avg: £2,193 GBP|-2.5%
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
November 6, 2026
Retailer 2£1,388 GBP
Retailer 6£1,474 GBP
Retailer 14£1,645 GBP
Retailer 4£1,691 GBP
Retailer 8£1,846 GBP
Retailer 3£1,863 GBP
Retailer 9£1,959 GBP
Retailer 7£1,967 GBP
Retailer 12£1,984 GBP
Retailer 11£2,149 GBP
Retailer 10£2,170 GBP
Retailer 13£2,274 GBP
Retailer 5£3,271 GBP
NZ Jewellers£3,895 GBP

23 data points across 14 retailers

21 retailers£1,388 GBP to £3,895 GBP

A
Cheapest Retailer
-
£1,388 GBP
A
Retailer 2
-
£1,474 GBP
View
Final sale: no returns
A
Retailer 3
-
£1,645 GBP
View
A
Retailer 4
-
£1,691 GBP
View
A
Retailer 5
-
£1,846 GBP
View
A
Retailer 6
-
£1,863 GBP
View
Retailer 7
-
£1,950 GBP
View
Price last confirmed 50 days ago
Retailer 8
-
£1,950 GBP
View
Price last confirmed 39 days ago
B+
Retailer 9
-
£1,959 GBP
View
B+
Retailer 10
-
£1,967 GBP
View
B+
Retailer 11
-
£1,984 GBP
View
B+
Retailer 12
-
£2,149 GBP
View
B+
Retailer 13
-
£2,170 GBP
View
Retailer 14
-
£2,185 GBP
View
Price last confirmed 30 days ago
Retailer 15
-
£2,251 GBP
View
Price last confirmed 38 days ago
Retailer 16
-
£2,251 GBP
View
Price last confirmed 50 days ago
B+
Retailer 17
-
£2,274 GBP
View
B
Retailer 18
-
£3,271 GBP
View
B
Retailer 19
-
£3,895 GBP
View
Retailer 20
-
£4,078 GBP
View
Price last confirmed 49 days ago
Most Expensive
NZ Jewellers
431de488-9f46-45fd-8a26-4ecad8c084cf · Sep 28
£4,078 GBP
$5,488 USD
View
Price last confirmed 39 days ago
20 more retailers have this diamond
Prices start from £1,388 GBPSave up to £2,507 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
1.01ct Round
£1,388 GBP