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Round|Natural|GIA

1.05ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 6505241872

Certificate GIA 6505241872

Diamond specifications and retailer prices

From £1,330 GBP
As of November 6, 2026
Save £2,360 GBP (64%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £3,690 GBP at NZ Jewellers · As of November 5, 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6505241872. Listed at 13 retailers as of November 5, 2026, with prices from £1,330 to £3,690, a £2,360 spread on the same certified stone. NZ Jewellers lists it at £3,690. 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 6505241872
Dimensions6.45 × 6.51 × 4.06 mm
L/W Ratio1.01
Girdle conditionSlightly Thick
Top View
6.45 mm6.51 mm1.05 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6505241872
Side View
Table 57.0%Crown 35.5°Girdle: MediumPavilion 41.2°Culet: NoneDepth 62.6%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £3,690 GBP|Low: £1,330 GBP|High: £3,858 GBP|Avg: £2,160 GBP|-4.4%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 2£1,330 GBP
Retailer 11£1,413 GBP
Retailer 9£1,594 GBP
Retailer 3£1,668 GBP
Retailer 4£1,689 GBP
Retailer 7£1,856 GBP
Retailer 5£1,869 GBP
Retailer 6£2,080 GBP
Retailer 8£2,155 GBP
Retailer 10£3,084 GBP
NZ Jewellers£3,690 GBP

27 data points across 11 retailers

13 retailers£1,330 GBP to £3,690 GBP

A
Cheapest Retailer
-
£1,330 GBP
A
Retailer 2
-
£1,413 GBP
View
Final sale: no returns
A
Retailer 3
-
£1,594 GBP
View
A
Retailer 4
-
£1,668 GBP
View
A
Retailer 5
-
£1,689 GBP
View
A
Retailer 6
-
£1,722 GBP
View
A
Retailer 7
-
£1,856 GBP
View
A
Retailer 8
-
£1,869 GBP
View
B+
Retailer 9
-
£2,080 GBP
View
B+
Retailer 10
-
£2,155 GBP
View
Retailer 11
-
£2,247 GBP
View
Price last confirmed 30 days ago
B
Retailer 12
-
£3,084 GBP
View
Most Expensive
B
NZ Jewellers
bd109b5e-5f66-43ef-8a97-8f8c565ab457 · Nov 5
£3,690 GBP
$4,967 USD
View
12 more retailers have this diamond
Prices start from £1,330 GBPSave up to £2,360 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
£1,330 GBP