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Round|Natural|GIA

1.00ct D SI2 Round Natural Diamond

EX • D/SI2 • GIA 6521858903

Certificate GIA 6521858903

Diamond specifications and retailer prices

From £1,778 GBP
As of November 4, 2026
Save £2,075 GBP (54%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £4,026 GBP at NZ Jewellers · As of September 26, 2026
View at NZ Jewellers

About this 1ct natural round diamond

This 1ct natural round sits in the classic one-carat band, graded D colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6521858903. Listed at 21 retailers as of November 4, 2026, with a 117% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
D
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle34°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6521858903
Dimensions6.46 × 6.42 × 3.88 mm
L/W Ratio1.01
Top View
6.46 mm6.42 mm1.00 ctD / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6521858903
Side View
Table 61.0%Crown 34°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 60.2%

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: £2,471 GBP|Low: £1,778 GBP|High: £3,911 GBP|Avg: £2,602 GBP
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 8£1,778 GBP
Retailer 5£1,850 GBP
Retailer 10£2,112 GBP
Retailer 2£2,132 GBP
Retailer 6£2,228 GBP
Retailer 3£2,376 GBP
Retailer 1£2,471 GBP
Retailer 4£2,684 GBP
Retailer 7£3,853 GBP
Retailer 9£3,897 GBP

36 data points across 10 retailers

21 retailers£1,778 GBP to £3,853 GBP

A
Cheapest Retailer
-
£1,778 GBP
A
Retailer 2
-
£1,850 GBP
View
A
Retailer 3
-
£2,112 GBP
View
A
Retailer 4
-
£2,132 GBP
View
Final sale: no returns
A
Retailer 5
-
£2,181 GBP
View
A
Retailer 6
-
£2,228 GBP
View
Retailer 7
-
£2,311 GBP
View
Price last confirmed 44 days ago
Retailer 8
-
£2,311 GBP
View
Price last confirmed 25 days ago
Retailer 9
-
£2,311 GBP
View
Price last confirmed 28 days ago
B+
Retailer 10
-
£2,340 GBP
View
B+
Retailer 11
-
£2,376 GBP
View
Retailer 12
-
£2,400 GBP
View
Price last confirmed 38 days ago
B+
Retailer 13
-
£2,417 GBP
View
B+
Retailer 14
-
£2,471 GBP
View
Retailer 15
-
£2,666 GBP
View
Price last confirmed 45 days ago
Retailer 16
-
£2,666 GBP
View
Price last confirmed 28 days ago
B+
Retailer 17
-
£2,684 GBP
View
B
Retailer 18
-
£3,853 GBP
View
Retailer 19
-
£3,897 GBP
View
Price last confirmed 9 days ago
Retailer 20
-
£4,026 GBP
View
Price last confirmed 46 days ago
Most Expensive
NZ Jewellers
648891c1-c419-4a43-b1f7-bc6f347ebb64 · Sep 26
£4,026 GBP
$5,418 USD
View
Price last confirmed 40 days ago
20 more retailers have this diamond
Prices start from £1,778 GBPSave up to £2,075 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
£1,778 GBP