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Round|Natural|GIA

1.05ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1555614721

Certificate GIA 1555614721

Diamond specifications and retailer prices

From £1,685 GBP
As of November 6, 2026
Save £2,619 GBP (61%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £4,304 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1555614721. Listed at 21 retailers as of November 5, 2026, with prices from £1,685 to £4,304, a £2,619 spread on the same certified stone. NZ Jewellers lists it at £4,304. 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°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 1555614721
Dimensions6.51 × 6.53 × 4.04 mm
L/W Ratio1.00
Girdle conditionSlightly Thick
Culet sizeNone
Key to symbols
Feather, Crystal, Needle, Cloud
Top View
6.51 mm6.53 mm1.05 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1555614721
Side View
Table 56.0%Crown 35°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 61.9%

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: £4,304 GBP|Low: £1,578 GBP|High: £4,304 GBP|Avg: £2,296 GBP
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
November 6, 2026
Retailer 7£1,685 GBP
Retailer 5£1,687 GBP
Retailer 6£1,722 GBP
Retailer 14£1,865 GBP
Retailer 16£1,865 GBP
Retailer 15£1,951 GBP
Retailer 9£1,968 GBP
Retailer 4£2,115 GBP
Retailer 3£2,152 GBP
Retailer 2£2,153 GBP
Retailer 8£2,306 GBP
Retailer 13£2,403 GBP
Retailer 10£2,424 GBP
Retailer 11£2,513 GBP
Retailer 12£3,598 GBP
NZ Jewellers£4,304 GBP

31 data points across 16 retailers

21 retailers£1,685 GBP to £4,304 GBP

A
Cheapest Retailer
-
£1,685 GBP
A
Retailer 2
-
£1,687 GBP
View
A
Retailer 3
-
£1,722 GBP
View
Final sale: no returns
A
Retailer 4
-
£1,796 GBP
View
A
Retailer 5
-
£1,865 GBP
View
Retailer 6
-
£1,865 GBP
View
Price last confirmed 8 days ago
B+
Retailer 7
-
£1,897 GBP
View
B+
Retailer 8
-
£1,951 GBP
View
B+
Retailer 9
-
£1,952 GBP
View
B+
Retailer 10
-
£1,968 GBP
View
B+
Retailer 11
-
£2,115 GBP
View
B+
Retailer 12
-
£2,152 GBP
View
B+
Retailer 13
-
£2,153 GBP
View
B+
Retailer 14
-
£2,303 GBP
View
Retailer 15
-
£2,306 GBP
View
Price last confirmed 30 days ago
B+
Retailer 16
-
£2,350 GBP
View
B+
Retailer 17
-
£2,403 GBP
View
B+
Retailer 18
-
£2,424 GBP
View
B
Retailer 19
-
£2,513 GBP
View
B
Retailer 20
-
£3,598 GBP
View
Most Expensive
B
NZ Jewellers
e8e9a1de-dcce-42c5-84ec-6cec898aa17c · Nov 5
£4,304 GBP
$5,793 USD
View
20 more retailers have this diamond
Prices start from £1,685 GBPSave up to £2,619 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
£1,685 GBP