Oval|Natural|GIA

1.51ct G SI1 Oval Natural Diamond

EX • G/SI1 • GIA 6555812571

Certificate GIA 6555812571

Diamond specifications and retailer prices

From £3,917 GBP
HK$41,000 HKD
As of November 1, 2026
Save £3,723 GBP (49%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £9,254 GBP at NZ Jewellers · As of October 20, 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 G 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 6555812571. Listed at 10 retailers as of October 29, 2026, with a 95% 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

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

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Pavilion angle35.77°
OriginNatural
Grading LabGIA
CertificateGIA 6555812571
Dimensions8.80 × 6.29 × 4.04 mm
L/W Ratio1.40
Key to symbols
Crystal, Cloud, Etch Channel, Needle
Top View
8.80 mm6.29 mm1.51 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6555812571
Side View
Table 61.0%CrownGirdle: STK-VTKPavilion 35.77°Culet: NoneDepth 64.2%

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 1
Current: £9,254 GBP|Low: £3,917 GBP|High: £9,660 GBP|Avg: £5,860 GBP|-4.2%
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 2, 2026
Retailer 4£3,917 GBP
Retailer 8£4,640 GBP
Retailer 5£4,716 GBP
Retailer 3£5,413 GBP
Retailer 7£5,533 GBP
Retailer 9£5,534 GBP
Retailer 2£5,793 GBP
Retailer 6£7,640 GBP
NZ Jewellers£9,254 GBP

39 data points across 9 retailers

10 retailers£3,917 GBP to £7,640 GBP

A
Cheapest Retailer
-
£3,917 GBP
HK$41,000 HKD
Retailer 2
-
£4,640 GBP
SGD 8,401 SGD
View
Price last confirmed 18 days ago
A
Retailer 3
-
£4,716 GBP
$6,319 USD
View
B+
Retailer 4
-
£5,413 GBP
€6,908 EUR
View
Retailer 5
-
£5,533 GBP
$7,414 USD
View
Price last confirmed 13 days ago
B+
Retailer 6
-
£5,534 GBP
A$11,408 AUD
View
Retailer 7
-
£5,618 GBP
$7,528 USD
View
Price last confirmed 16 days ago
B+
Retailer 8
-
£5,793 GBP
€7,392 EUR
View
B
Retailer 9
-
£7,640 GBP
View
Most Expensive
NZ Jewellers
8f68d38d-4ac2-40b8-9069-7abb2e366b68 · Oct 20
£9,254 GBP
$12,400 USD
View
Price last confirmed 12 days ago
9 more retailers have this diamond
Prices start from £3,917 GBPSave up to £3,723 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
£3,917 GBP