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Oval|Natural|GIA

1.40ct K SI1 Oval Natural Diamond

ID • K/SI1 • GIA 5553967650

Certificate GIA 5553967650

Diamond specifications and retailer prices

From £1,580 GBP
As of November 6, 2026
Save £2,037 GBP (56%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £4,526 GBP at NZ Jewellers · As of September 30, 2026
View at NZ Jewellers

About this 1.4ct natural oval diamond

This 1.4ct natural oval sits in the one-and-a-quarter to one-and-a-half carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 5553967650. Listed at 16 retailers as of November 4, 2026, with a 129% 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
K
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishExcellent
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 5553967650
Dimensions8.87 × 6.31 × 3.67 mm
L/W Ratio1.41
Girdle conditionFaceted
Culet sizeNone
Key to symbols
Feather, Crystal, Cloud, Knot, Indented Natural, Needle, Natural
Top View
8.87 mm6.31 mm1.40 ctK / SI1
OriginNatural
CutIdeal
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 5553967650
Side View
Table 58.0%CrownGirdle: THN-VTKPavilionCulet: NoneDepth 58.1%

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: £1,580 GBP|Low: £1,580 GBP|High: £3,733 GBP|Avg: £2,241 GBP|-4.6%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 1£1,580 GBP
Retailer 4£1,815 GBP
Retailer 10£1,849 GBP
Retailer 11£1,907 GBP
Retailer 3£1,910 GBP
Retailer 5£2,007 GBP
Retailer 2£2,032 GBP
Retailer 12£2,176 GBP
Retailer 7£2,191 GBP
Retailer 6£2,409 GBP
Retailer 8£2,526 GBP
Retailer 9£3,617 GBP

23 data points across 12 retailers

16 retailers£1,580 GBP to £3,617 GBP

A
Cheapest Retailer
-
£1,580 GBP
A
Retailer 2
-
£1,815 GBP
View
A
Retailer 3
-
£1,849 GBP
View
A
Retailer 4
-
£1,907 GBP
View
B+
Retailer 5
-
£1,910 GBP
View
Final sale: no returns
A
Retailer 6
-
£2,007 GBP
View
A
Retailer 7
-
£2,032 GBP
View
Retailer 8
-
£2,108 GBP
View
Price last confirmed 30 days ago
B+
Retailer 9
-
£2,176 GBP
View
B+
Retailer 10
-
£2,191 GBP
View
Retailer 11
-
£2,248 GBP
View
Price last confirmed 38 days ago
B+
Retailer 12
-
£2,409 GBP
View
Retailer 13
-
£2,432 GBP
View
Price last confirmed 30 days ago
B+
Retailer 14
-
£2,526 GBP
View
B
Retailer 15
-
£3,617 GBP
View
Most Expensive
NZ Jewellers
d546049e-de6e-41fb-9a1f-20a641474722 · Sep 30
£4,526 GBP
$6,058 USD
View
Price last confirmed 37 days ago
15 more retailers have this diamond
Prices start from £1,580 GBPSave up to £2,037 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 Oval
£1,580 GBP