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Oval|Natural|GIA

1.51ct G SI1 Oval Natural Diamond

EX • G/SI1 • GIA 6555496656

Certificate GIA 6555496656

Diamond specifications and retailer prices

From £5,730 GBP
$7,678 USD
As of November 1, 2026
Save £6,183 GBP (52%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £11,913 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 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 6555496656. Listed at 21 retailers as of October 30, 2026, with prices from £5,730 to £11,913, a £6,183 spread on the same certified stone. NZ Jewellers lists it at £11,913. 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
Crown angle37.5°
Pavilion angle37.7°
OriginNatural
Grading LabGIA
CertificateGIA 6555496656
Dimensions9.18 × 6.40 × 4.01 mm
L/W Ratio1.43
Culet sizeNone
Key to symbols
Crystal, Cloud, Feather, Needle
Top View
9.18 mm6.40 mm1.51 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6555496656
Side View
Table 62.0%Crown 37.5°Girdle: THN-THKPavilion 37.7°Culet: NoneDepth 62.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £11,913 GBP|Low: £5,799 GBP|High: £11,913 GBP|Avg: £7,409 GBP
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
Retailer 14
Retailer 15
November 2, 2026
Retailer 15£5,799 GBP
Retailer 3£6,012 GBP
Retailer 7£6,404 GBP
Retailer 4£6,574 GBP
Retailer 11£6,574 GBP
Retailer 14£6,578 GBP
Retailer 2£6,594 GBP
Retailer 5£6,793 GBP
Retailer 13£7,122 GBP
Retailer 12£7,232 GBP
Retailer 6£7,357 GBP
Retailer 10£8,219 GBP
Retailer 9£8,750 GBP
Retailer 8£9,927 GBP
NZ Jewellers£11,913 GBP

46 data points across 15 retailers

21 retailers£5,730 GBP to £11,913 GBP

B+
Cheapest Retailer
-
£5,730 GBP
$7,678 USD
B+
Retailer 2
-
£5,799 GBP
$7,770 USD
View
B+
Retailer 3
-
£6,012 GBP
SGD 10,886 SGD
View
B+
Retailer 4
-
£6,156 GBP
$8,248 USD
View
B
Retailer 5
-
£6,404 GBP
$8,580 USD
View
B
Retailer 6
-
£6,527 GBP
$8,745 USD
View
B
Retailer 7
-
£6,574 GBP
$8,809 USD
View
Final sale: no returns
B
Retailer 8
-
£6,574 GBP
$8,809 USD
View
Retailer 9
-
£6,578 GBP
A$13,560 AUD
View
Price last confirmed 9 days ago
B+
Retailer 10
-
£6,594 GBP
View
B
Retailer 11
-
£7,025 GBP
$9,412 USD
View
B
Retailer 12
-
£7,122 GBP
$9,543 USD
View
Retailer 13
-
£7,122 GBP
$9,543 USD
View
Price last confirmed 7 days ago
B
Retailer 14
-
£7,232 GBP
$9,690 USD
View
B
Retailer 15
-
£7,282 GBP
$9,757 USD
View
B
Retailer 16
-
£7,357 GBP
$9,858 USD
View
Retailer 17
-
£8,219 GBP
$11,012 USD
View
Price last confirmed 62 days ago
B
Retailer 18
-
£8,219 GBP
$11,012 USD
View
B
Retailer 19
-
£8,750 GBP
ZAR 189,411 ZAR
View
B
Retailer 20
-
£9,927 GBP
View
Most Expensive
B
NZ Jewellers
5d7088cb-e287-4cbf-91e0-5155794ec581 · Oct 30
£11,913 GBP
$15,962 USD
View
20 more retailers have this diamond
Prices start from £5,730 GBPSave up to £6,183 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.

B+
1.51ct Oval
£5,730 GBP