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Round|Natural|GIA

1.05ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 2556452598

Certificate GIA 2556452598

Diamond specifications and retailer prices

From £1,284 GBP
As of November 6, 2026
Save £1,702 GBP (57%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £3,678 GBP at NZ Jewellers · As of September 19, 2026
View at NZ Jewellers

About this 1.05ct natural round diamond

This 1.05ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2556452598. Listed at 20 retailers as of November 2, 2026, with a 133% 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

1.05
Carat
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2556452598
Dimensions6.46 × 6.50 × 4.06 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
Top View
6.46 mm6.50 mm1.05 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556452598
Side View
Table 57.0%Crown 35.5°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.7%

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: £1,779 GBP|Low: £1,284 GBP|High: £3,118 GBP|Avg: £1,807 GBP|-1.0%
Retailer 1
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
November 6, 2026
Retailer 16£1,284 GBP
Retailer 5£1,307 GBP
Retailer 4£1,418 GBP
Retailer 11£1,461 GBP
Retailer 15£1,462 GBP
Retailer 2£1,555 GBP
Retailer 13£1,573 GBP
Retailer 6£1,684 GBP
Retailer 8£1,723 GBP
Retailer 1£1,779 GBP
Retailer 9£1,860 GBP
Retailer 10£1,958 GBP
Retailer 7£1,987 GBP
Retailer 14£2,007 GBP
Retailer 12£2,473 GBP
Retailer 3£2,986 GBP

30 data points across 16 retailers

20 retailers£1,284 GBP to £2,986 GBP

A
Cheapest Retailer
-
£1,284 GBP
Retailer 2
-
£1,307 GBP
View
Price last confirmed 17 days ago
Retailer 3
-
£1,418 GBP
View
Price last confirmed 11 days ago
A
Retailer 4
-
£1,461 GBP
View
A
Retailer 5
-
£1,462 GBP
View
A
Retailer 6
-
£1,555 GBP
View
A
Retailer 7
-
£1,573 GBP
View
Final sale: no returns
Retailer 8
-
£1,723 GBP
View
Price last confirmed 17 days ago
A
Retailer 9
-
£1,742 GBP
View
A
Retailer 10
-
£1,779 GBP
View
Retailer 11
-
£1,840 GBP
View
Price last confirmed 22 days ago
B+
Retailer 12
-
£1,860 GBP
View
B+
Retailer 13
-
£1,958 GBP
View
Retailer 14
-
£1,987 GBP
View
Price last confirmed 19 days ago
B+
Retailer 15
-
£2,007 GBP
View
Retailer 16
-
£2,030 GBP
View
Price last confirmed 48 days ago
B+
Retailer 17
-
£2,473 GBP
View
B
Retailer 18
-
£2,986 GBP
View
Retailer 19
-
£3,678 GBP
View
Price last confirmed 20 days ago
Most Expensive
NZ Jewellers
05f53ec0-77c7-4a2a-a7d4-89ef61e356d8 · Sep 19
£3,678 GBP
$4,950 USD
View
Price last confirmed 47 days ago
19 more retailers have this diamond
Prices start from £1,284 GBPSave up to £1,702 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
1.05ct Round
£1,284 GBP