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Round|Natural|GIA

1.00ct K SI1 Round Natural Diamond

EX • K/SI1 • GIA 6505412227

Certificate GIA 6505412227

Diamond specifications and retailer prices

From £1,198 GBP
As of November 4, 2026
Save £2,067 GBP (63%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £3,265 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6505412227. Listed at 16 retailers as of November 4, 2026, with prices from £1,198 to £3,265, a £2,067 spread on the same certified stone. NZ Jewellers lists it at £3,265. 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
K
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle31.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 6505412227
Dimensions6.47 × 6.43 × 3.92 mm
L/W Ratio1.01
Star length50%
Lower girdle75%
Top View
6.47 mm6.43 mm1.00 ctK / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6505412227
Side View
Table 59.0%Crown 31.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 60.8%

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 4
Current: £1,281 GBP|Low: £1,174 GBP|High: £2,374 GBP|Avg: £1,529 GBP|-1.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 11£1,198 GBP
Retailer 3£1,220 GBP
Retailer 10£1,241 GBP
Retailer 1£1,281 GBP
Retailer 12£1,343 GBP
Retailer 2£1,382 GBP
Retailer 4£1,401 GBP
Retailer 8£1,477 GBP
Retailer 5£1,552 GBP
Retailer 7£1,634 GBP
Retailer 6£1,814 GBP
Retailer 9£2,339 GBP

37 data points across 12 retailers

16 retailers£1,198 GBP to £3,265 GBP

A
Cheapest Retailer
-
£1,198 GBP
A
Retailer 2
-
£1,220 GBP
View
A
Retailer 3
-
£1,241 GBP
View
A
Retailer 4
-
£1,281 GBP
View
Retailer 5
-
£1,339 GBP
View
Price last confirmed 8 days ago
B+
Retailer 6
-
£1,339 GBP
View
B+
Retailer 7
-
£1,343 GBP
View
B+
Retailer 8
-
£1,382 GBP
View
B+
Retailer 9
-
£1,401 GBP
View
B+
Retailer 10
-
£1,477 GBP
View
B+
Retailer 11
-
£1,545 GBP
View
B+
Retailer 12
-
£1,552 GBP
View
B+
Retailer 13
-
£1,634 GBP
View
B
Retailer 14
-
£1,814 GBP
View
B
Retailer 15
-
£2,339 GBP
View
Most Expensive
B
NZ Jewellers
86dc830f-720d-427e-b48b-c56f5dd959f7 · Nov 5
£3,265 GBP
$4,395 USD
View
15 more retailers have this diamond
Prices start from £1,198 GBPSave up to £2,067 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
£1,198 GBP