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Round|Natural|GIA

1.00ct I SI1 Round Natural Diamond

EX • I/SI1 • GIA 1423768522

Certificate GIA 1423768522

Diamond specifications and retailer prices

From £1,500 GBP
HK$15,700 HKD
As of October 31, 2026
Save £2,639 GBP (64%) vs most expensive(unlock to see where)
23 retailers carry this diamond
Most expensive: £4,139 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 1423768522. Listed at 23 retailers as of October 30, 2026, with prices from £1,500 to £4,139, a £2,639 spread on the same certified stone. NZ Jewellers lists it at £4,139. 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
I
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 1423768522
Dimensions6.36 × 6.39 × 3.95 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.36 mm6.39 mm1.00 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1423768522
Side View
Table 60.0%Crown 35.5°Girdle: MED-STKPavilion 41.2°Culet: NoneDepth 62.0%

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 31
Current: £4,139 GBP|Low: £1,433 GBP|High: £4,139 GBP|Avg: £2,095 GBP|+0.7%
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
Retailer 20
Retailer 21
Retailer 22
October 31, 2026
Retailer 16£1,500 GBP
Retailer 10£1,534 GBP
Retailer 22£1,588 GBP
Retailer 5£1,620 GBP
Retailer 3£1,655 GBP
Retailer 9£1,655 GBP
Retailer 11£1,730 GBP
Retailer 14£1,730 GBP
Retailer 18£1,787 GBP
Retailer 12£1,810 GBP
Retailer 7£1,911 GBP
Retailer 17£1,955 GBP
Retailer 4£2,060 GBP
Retailer 6£2,060 GBP
Retailer 20£2,070 GBP
Retailer 19£2,103 GBP
Retailer 8£2,127 GBP
Retailer 21£2,322 GBP
Retailer 2£2,422 GBP
Retailer 13£2,433 GBP
Retailer 15£3,351 GBP
NZ Jewellers£4,139 GBP

17 data points across 22 retailers

23 retailers£1,500 GBP to £4,139 GBP

A
Cheapest Retailer
-
£1,500 GBP
HK$15,700 HKD
A
Retailer 2
-
£1,534 GBP
$2,055 USD
View
A
Retailer 3
-
£1,588 GBP
$2,128 USD
View
A
Retailer 4
-
£1,620 GBP
$2,170 USD
View
A
Retailer 5
-
£1,655 GBP
$2,218 USD
View
Final sale: no returns
A
Retailer 6
-
£1,655 GBP
$2,218 USD
View
A
Retailer 7
-
£1,730 GBP
$2,318 USD
View
A
Retailer 8
-
£1,730 GBP
$2,318 USD
View
A
Retailer 9
-
£1,787 GBP
$2,395 USD
View
A
Retailer 10
-
£1,810 GBP
$2,425 USD
View
B+
Retailer 11
-
£1,911 GBP
View
B+
Retailer 12
-
£1,955 GBP
$2,619 USD
View
B+
Retailer 13
-
£2,060 GBP
$2,760 USD
View
B+
Retailer 14
-
£2,060 GBP
$2,760 USD
View
B+
Retailer 15
-
£2,070 GBP
$2,773 USD
View
B+
Retailer 16
-
£2,103 GBP
View
B+
Retailer 17
-
£2,127 GBP
$2,850 USD
View
Retailer 18
-
£2,244 GBP
A$4,625 AUD
View
Price last confirmed 23 days ago
B+
Retailer 19
-
£2,322 GBP
€2,963 EUR
View
B+
Retailer 20
-
£2,422 GBP
$3,245 USD
View
B+
Retailer 21
-
£2,433 GBP
ZAR 52,674 ZAR
View
B
Retailer 22
-
£3,351 GBP
View
Most Expensive
B
NZ Jewellers
7330d7c4-5473-4174-83b5-06070554d291 · Oct 30
£4,139 GBP
$5,546 USD
View
22 more retailers have this diamond
Prices start from £1,500 GBPSave up to £2,639 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
£1,500 GBP