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Oval|Natural|GIA

1.51ct I SI1 Oval Natural Diamond

EX • I/SI1 • GIA 2557187780

Certificate GIA 2557187780

Diamond specifications and retailer prices

From £2,875 GBP
HK$30,100 HKD
As of November 1, 2026
Save £3,786 GBP (57%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £6,662 GBP at NZ Jewellers · As of October 30, 2026
View at NZ Jewellers

About this 1.51ct natural oval diamond

This 1.51ct natural oval sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 2557187780. Listed at 11 retailers as of October 30, 2026, with prices from £2,875 to £6,662, a £3,786 spread on the same certified stone. NZ Jewellers lists it at £6,662. 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

1.51
Carat
I
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 2557187780
Dimensions8.84 × 6.32 × 4.10 mm
L/W Ratio1.40
Key to symbols
Crystal, Feather, Cloud, Needle
Top View
8.84 mm6.32 mm1.51 ctI / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557187780
Side View
Table 62.0%CrownGirdle: STK-THKPavilionCulet: NoneDepth 64.8%

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 1
Current: £6,662 GBP|Low: £2,875 GBP|High: £7,113 GBP|Avg: £4,322 GBP|-6.3%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 4£2,875 GBP
Retailer 6£3,286 GBP
Retailer 8£3,506 GBP
Retailer 9£3,629 GBP
Retailer 11£3,719 GBP
Retailer 3£3,738 GBP
Retailer 7£3,915 GBP
Retailer 10£3,983 GBP
Retailer 2£4,442 GBP
Retailer 5£6,344 GBP
NZ Jewellers£6,662 GBP

42 data points across 11 retailers

11 retailers£2,875 GBP to £6,662 GBP

A
Cheapest Retailer
-
£2,875 GBP
HK$30,100 HKD
A
Retailer 2
-
£3,286 GBP
€4,193 EUR
View
A
Retailer 3
-
£3,506 GBP
$4,698 USD
View
A
Retailer 4
-
£3,629 GBP
$4,863 USD
View
Retailer 5
-
£3,719 GBP
SGD 6,734 SGD
View
Price last confirmed 7 days ago
A
Retailer 6
-
£3,738 GBP
$5,009 USD
View
Final sale: no returns
A
Retailer 7
-
£3,915 GBP
$5,246 USD
View
B+
Retailer 8
-
£3,983 GBP
$5,337 USD
View
B+
Retailer 9
-
£4,442 GBP
€5,668 EUR
View
B
Retailer 10
-
£6,344 GBP
View
Most Expensive
B
NZ Jewellers
5b2d960c-fe95-4daa-a8f4-fc95cf67fffe · Oct 30
£6,662 GBP
$8,926 USD
View
10 more retailers have this diamond
Prices start from £2,875 GBPSave up to £3,786 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
1.51ct Oval
£2,875 GBP