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Round|Natural|GIA

1.00ct H SI1 Round Natural Diamond

EX • H/SI1 • GIA 5556893217

Certificate GIA 5556893217

Diamond specifications and retailer prices

From £1,783 GBP
$2,389 USD
As of October 30, 2026
Save £2,811 GBP (61%) vs most expensive(unlock to see where)
22 retailers carry this diamond
Most expensive: £4,594 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct 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 5556893217. Listed at 22 retailers as of October 30, 2026, with prices from £1,783 to £4,594, a £2,811 spread on the same certified stone. NZ Jewellers lists it at £4,594. 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
H
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 5556893217
Dimensions6.34 × 6.39 × 3.98 mm
L/W Ratio1.01
Girdle conditionSlightly Thick
Key to symbols
Crystal, Feather, Needle
Top View
6.34 mm6.39 mm1.00 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 5556893217
Side View
Table 55.0%Crown 35°Girdle: Med. - Sli. ThickPavilion 40.6°Culet: NoneDepth 62.5%

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: Oct 30
Current: £4,594 GBP|Low: £1,684 GBP|High: £4,594 GBP|Avg: £2,496 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
Retailer 17
Retailer 18
November 1, 2026
Retailer 5£1,754 GBP
Retailer 8£1,783 GBP
Retailer 7£1,837 GBP
Retailer 9£1,963 GBP
Retailer 15£1,991 GBP
Retailer 18£1,991 GBP
Retailer 16£2,067 GBP
Retailer 2£2,114 GBP
Retailer 6£2,258 GBP
Retailer 3£2,297 GBP
Retailer 12£2,336 GBP
Retailer 10£2,462 GBP
Retailer 4£2,559 GBP
Retailer 11£2,562 GBP
Retailer 13£2,701 GBP
Retailer 17£3,680 GBP
Retailer 14£3,810 GBP
NZ Jewellers£4,594 GBP

29 data points across 18 retailers

22 retailers£1,783 GBP to £4,594 GBP

Retailer 1
-
£1,754 GBP
$2,350 USD
Price last confirmed 10 days ago
A
Retailer 2
-
£1,783 GBP
$2,389 USD
View
B+
Retailer 3
-
£1,837 GBP
$2,461 USD
View
Final sale: no returns
B+
Retailer 4
-
£1,892 GBP
$2,535 USD
View
B+
Retailer 5
-
£1,963 GBP
$2,630 USD
View
B+
Retailer 6
-
£1,991 GBP
$2,668 USD
View
B+
Retailer 7
-
£1,991 GBP
$2,668 USD
View
B+
Retailer 8
-
£2,019 GBP
$2,705 USD
View
B+
Retailer 9
-
£2,067 GBP
$2,770 USD
View
B+
Retailer 10
-
£2,114 GBP
View
B+
Retailer 11
-
£2,258 GBP
$3,025 USD
View
B
Retailer 12
-
£2,297 GBP
$3,078 USD
View
B+
Retailer 13
-
£2,336 GBP
View
Retailer 14
-
£2,462 GBP
A$5,076 AUD
View
Price last confirmed 24 days ago
B+
Retailer 15
-
£2,494 GBP
$3,342 USD
View
Retailer 16
-
£2,552 GBP
$3,419 USD
View
Price last confirmed 17 days ago
B+
Retailer 17
-
£2,559 GBP
View
B+
Retailer 18
-
£2,562 GBP
€3,269 EUR
View
B
Retailer 19
-
£2,701 GBP
ZAR 58,471 ZAR
View
Retailer 20
-
£3,680 GBP
View
Price last confirmed 7 days ago
B
Retailer 21
-
£3,810 GBP
View
Most Expensive
B
NZ Jewellers
87d487b7-68e7-47e4-8469-29aec22710e0 · Oct 30
£4,594 GBP
$6,156 USD
View
21 more retailers have this diamond
Prices start from £1,783 GBPSave up to £2,811 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
£1,783 GBP