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Radiant|Natural|GIA

1.00ct H SI1 Radiant Natural Diamond

GD • H/SI1 • GIA 2556511021

Certificate GIA 2556511021

Diamond specifications and retailer prices

From £1,399 GBP
As of November 6, 2026
Save £2,555 GBP (65%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £3,954 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1ct natural radiant diamond

This 1ct natural radiant sits in the classic one-carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 2556511021. Listed at 21 retailers as of November 5, 2026, with prices from £1,399 to £3,954, a £2,555 spread on the same certified stone. NZ Jewellers lists it at £3,954. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.00
Carat
H
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2556511021
Dimensions7.71 × 4.78 × 3.20 mm
L/W Ratio1.61
Girdle conditionPolished
Culet sizeNone
Key to symbols
Feather, Needle, Pinpoint
Top View
7.71 mm4.78 mm1.00 ctH / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2556511021
Side View
Table 69.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 66.8%

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: £3,954 GBP|Low: £1,336 GBP|High: £3,954 GBP|Avg: £2,023 GBP|+5.1%
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
Retailer 17
Retailer 18
Retailer 19
November 7, 2026
Retailer 16£1,399 GBP
Retailer 7£1,659 GBP
Retailer 4£1,671 GBP
Retailer 6£1,709 GBP
Retailer 14£1,733 GBP
Retailer 10£1,746 GBP
Retailer 11£1,790 GBP
Retailer 2£1,864 GBP
Retailer 5£1,892 GBP
Retailer 12£1,965 GBP
Retailer 13£1,987 GBP
Retailer 17£1,996 GBP
Retailer 15£2,129 GBP
Retailer 19£2,167 GBP
Retailer 8£2,178 GBP
Retailer 18£2,192 GBP
Retailer 3£2,309 GBP
Retailer 9£3,118 GBP
NZ Jewellers£3,954 GBP

17 data points across 19 retailers

21 retailers£1,399 GBP to £3,954 GBP

A
Cheapest Retailer
-
£1,399 GBP
B+
Retailer 2
-
£1,659 GBP
View
B+
Retailer 3
-
£1,671 GBP
View
B+
Retailer 4
-
£1,709 GBP
View
B+
Retailer 5
-
£1,733 GBP
View
Final sale: no returns
B+
Retailer 6
-
£1,746 GBP
View
Retailer 7
-
£1,790 GBP
View
Price last confirmed 9 days ago
B
Retailer 8
-
£1,864 GBP
View
B
Retailer 9
-
£1,892 GBP
View
B
Retailer 10
-
£1,965 GBP
View
B
Retailer 11
-
£1,987 GBP
View
B
Retailer 12
-
£1,996 GBP
View
Retailer 13
-
£2,112 GBP
View
Price last confirmed 62 days ago
B
Retailer 14
-
£2,129 GBP
View
B
Retailer 15
-
£2,167 GBP
View
B
Retailer 16
-
£2,178 GBP
View
B
Retailer 17
-
£2,192 GBP
View
Retailer 18
-
£2,229 GBP
View
Price last confirmed 31 days ago
B
Retailer 19
-
£2,309 GBP
View
B
Retailer 20
-
£3,118 GBP
View
Most Expensive
C
NZ Jewellers
ddff99e5-3010-47f4-a91f-cf2cb293f2eb · Nov 5
£3,954 GBP
$5,293 USD
View
20 more retailers have this diamond
Prices start from £1,399 GBPSave up to £2,555 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 Radiant
£1,399 GBP