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Round|Natural|GIA

1.40ct M SI1 Round Natural Diamond

EX • M/SI1 • GIA 2558103659

Certificate GIA 2558103659

Diamond specifications and retailer prices

From £1,227 GBP
As of November 4, 2026
Save £2,261 GBP (65%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £3,629 GBP at NZ Jewellers · As of September 25, 2026
View at NZ Jewellers

About this 1.4ct natural round diamond

This 1.4ct natural round sits in the one-and-a-quarter to one-and-a-half carat band, graded M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2558103659. Listed at 14 retailers as of November 4, 2026, with a 184% 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

1.40
Carat
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle36°
Pavilion angle40.6°
OriginNatural
Grading LabGIA
CertificateGIA 2558103659
Dimensions7.12 × 7.06 × 4.45 mm
L/W Ratio1.01
Top View
7.12 mm7.06 mm1.40 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2558103659
Side View
Table 57.0%Crown 36°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 62.8%

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: £3,488 GBP|Low: £1,217 GBP|High: £3,629 GBP|Avg: £1,920 GBP|-3.9%
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
November 6, 2026
Retailer 10£1,227 GBP
Retailer 12£1,356 GBP
Retailer 8£1,540 GBP
Retailer 2£1,641 GBP
Retailer 3£1,675 GBP
Retailer 13£1,690 GBP
Retailer 11£1,736 GBP
Retailer 4£1,791 GBP
Retailer 7£1,833 GBP
Retailer 5£2,036 GBP
Retailer 6£2,036 GBP
Retailer 9£2,490 GBP
NZ Jewellers£3,488 GBP

39 data points across 13 retailers

14 retailers£1,227 GBP to £3,488 GBP

A
Cheapest Retailer
-
£1,227 GBP
Retailer 2
-
£1,356 GBP
View
Price last confirmed 16 days ago
A
Retailer 3
-
£1,540 GBP
View
Final sale: no returns
B+
Retailer 4
-
£1,641 GBP
View
B+
Retailer 5
-
£1,675 GBP
View
B+
Retailer 6
-
£1,690 GBP
View
B+
Retailer 7
-
£1,727 GBP
View
B+
Retailer 8
-
£1,736 GBP
View
B+
Retailer 9
-
£1,791 GBP
View
B+
Retailer 10
-
£1,833 GBP
View
B
Retailer 11
-
£2,036 GBP
View
B
Retailer 12
-
£2,490 GBP
View
B
Retailer 13
-
£3,488 GBP
View
Most Expensive
NZ Jewellers
24342ae1-9916-4907-a630-cfa04c6aec93 · Sep 25
£3,629 GBP
$4,884 USD
View
Price last confirmed 41 days ago
13 more retailers have this diamond
Prices start from £1,227 GBPSave up to £2,261 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
1.40ct Round
£1,227 GBP