Oval|Natural|GIA

1.51ct H SI1 Oval Natural Diamond

GD • H/SI1 • GIA 5436230726

Certificate GIA 5436230726

Diamond specifications and retailer prices

From £4,280 GBP
HK$44,800 HKD
As of November 1, 2026
Save £5,461 GBP (56%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £9,740 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 H colour (near-colourless) and SI1 clarity (slightly-included), with a standard cut grade stated by the retailer rather than the lab and certified by GIA 5436230726. Listed at 19 retailers as of October 30, 2026, with prices from £4,280 to £9,740, a £5,461 spread on the same certified stone. NZ Jewellers lists it at £9,740. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.51
Carat
H
Colour
SI1
Clarity
Good
Cut (retailer stated)

Specifications

Cut (retailer stated)Good
PolishExcellent
SymmetryVery Good
FluorescenceMedium
OriginNatural
Grading LabGIA
CertificateGIA 5436230726
Dimensions8.65 × 6.39 × 3.97 mm
L/W Ratio1.35
Top View
8.65 mm6.39 mm1.51 ctH / SI1
OriginNatural
CutGood
PolishExcellent
SymmetryVery Good
FluorescenceMedium
CertificateGIA 5436230726
Side View
Table 58.0%CrownGirdle: THN-THKPavilionCulet: NoneDepth 62.1%

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: £6,362 GBP|Low: £4,070 GBP|High: £8,214 GBP|Avg: £5,852 GBP|+2.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 2, 2026
Retailer 7£4,280 GBP
Retailer 11£4,549 GBP
Retailer 2£4,871 GBP
Retailer 9£4,874 GBP
Retailer 3£5,357 GBP
Retailer 4£5,491 GBP
Retailer 10£5,615 GBP
Retailer 1£6,362 GBP
Retailer 8£6,417 GBP
Retailer 6£7,155 GBP
Retailer 5£8,116 GBP

42 data points across 11 retailers

19 retailers£4,280 GBP to £9,740 GBP

B+
Cheapest Retailer
-
£4,280 GBP
HK$44,800 HKD
B+
Retailer 2
-
£4,549 GBP
$6,095 USD
View
B
Retailer 3
-
£4,871 GBP
$6,526 USD
View
B
Retailer 4
-
£4,871 GBP
$6,526 USD
View
Final sale: no returns
B+
Retailer 5
-
£4,874 GBP
$6,530 USD
View
B
Retailer 6
-
£4,911 GBP
$6,580 USD
View
B
Retailer 7
-
£5,276 GBP
$7,069 USD
View
B
Retailer 8
-
£5,357 GBP
$7,178 USD
View
B
Retailer 9
-
£5,491 GBP
View
Retailer 10
-
£5,615 GBP
A$11,574 AUD
View
Price last confirmed 11 days ago
B
Retailer 11
-
£5,775 GBP
$7,738 USD
View
B
Retailer 12
-
£5,844 GBP
$7,830 USD
View
B
Retailer 13
-
£5,844 GBP
$7,830 USD
View
B
Retailer 14
-
£6,038 GBP
$8,090 USD
View
B
Retailer 15
-
£6,088 GBP
$8,157 USD
View
B
Retailer 16
-
£6,362 GBP
€8,118 EUR
View
B
Retailer 17
-
£7,155 GBP
ZAR 154,887 ZAR
View
B
Retailer 18
-
£8,116 GBP
View
Most Expensive
C
NZ Jewellers
085bec04-f988-43f7-91dc-f6504d0faaee · Oct 30
£9,740 GBP
$13,051 USD
View
18 more retailers have this diamond
Prices start from £4,280 GBPSave up to £5,461 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
£4,280 GBP