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Oval|Natural|GIA

1.51ct H SI1 Oval Natural Diamond

EX • H/SI1 • GIA 6521073458

Certificate GIA 6521073458

Diamond specifications and retailer prices

From £4,843 GBP
$6,489 USD
As of October 28, 2026
Save £5,409 GBP (53%) vs most expensive(unlock to see where)
24 retailers carry this diamond
Most expensive: £10,252 GBP at NZ Jewellers · As of October 27, 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 top-tier cut grade stated by the retailer rather than the lab and certified by GIA 6521073458. Listed at 24 retailers as of October 27, 2026, with prices from £4,843 to £10,252, a £5,409 spread on the same certified stone. NZ Jewellers lists it at £10,252. 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
H
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle36.88°
Pavilion angle39.48°
OriginNatural
Grading LabGIA
CertificateGIA 6521073458
Dimensions9.06 × 6.44 × 3.96 mm
L/W Ratio1.41
Top View
9.06 mm6.44 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateGIA 6521073458
Side View
Table 60.0%Crown 36.88°Girdle: MED-THKPavilion 39.48°Culet: NoneDepth 61.5%

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: Oct 28
Current: £10,252 GBP|Low: £4,698 GBP|High: £10,252 GBP|Avg: £6,292 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
Retailer 16
Retailer 17
Retailer 18
Retailer 19
October 29, 2026
Retailer 7£4,843 GBP
Retailer 11£4,877 GBP
Retailer 6£5,126 GBP
Retailer 19£5,126 GBP
Retailer 8£5,131 GBP
Retailer 9£5,168 GBP
Retailer 10£5,520 GBP
Retailer 17£5,553 GBP
Retailer 18£5,639 GBP
Retailer 2£5,784 GBP
Retailer 12£5,809 GBP
Retailer 4£5,876 GBP
Retailer 5£5,877 GBP
Retailer 3£6,407 GBP
Retailer 14£6,687 GBP
Retailer 16£7,463 GBP
Retailer 15£8,554 GBP
Retailer 13£8,588 GBP
NZ Jewellers£10,252 GBP

28 data points across 19 retailers

24 retailers£4,843 GBP to £10,252 GBP

B+
Cheapest Retailer
-
£4,843 GBP
$6,489 USD
B+
Retailer 2
-
£4,877 GBP
$6,534 USD
View
B+
Retailer 3
-
£5,126 GBP
$6,868 USD
View
B+
Retailer 4
-
£5,131 GBP
$6,875 USD
View
B+
Retailer 5
-
£5,168 GBP
$6,925 USD
View
Retailer 6
-
£5,459 GBP
$7,314 USD
View
Price last confirmed 8 days ago
B
Retailer 7
-
£5,520 GBP
$7,396 USD
View
B
Retailer 8
-
£5,553 GBP
$7,441 USD
View
B+
Retailer 9
-
£5,639 GBP
$7,555 USD
View
B+
Retailer 10
-
£5,784 GBP
View
B+
Retailer 11
-
£5,809 GBP
View
Retailer 12
-
£5,876 GBP
A$12,112 AUD
View
Price last confirmed 11 days ago
B+
Retailer 13
-
£5,877 GBP
$7,875 USD
View
Retailer 14
-
£5,877 GBP
$7,875 USD
View
Price last confirmed 24 days ago
B+
Retailer 15
-
£5,903 GBP
$7,910 USD
View
B+
Retailer 16
-
£5,903 GBP
$7,910 USD
View
B
Retailer 17
-
£6,105 GBP
$8,180 USD
View
B
Retailer 18
-
£6,188 GBP
$8,292 USD
View
B
Retailer 19
-
£6,407 GBP
$8,585 USD
View
B
Retailer 20
-
£6,687 GBP
€8,533 EUR
View
B
Retailer 21
-
£7,463 GBP
ZAR 161,553 ZAR
View
B
Retailer 22
-
£8,554 GBP
View
B
Retailer 23
-
£8,588 GBP
View
Most Expensive
B
NZ Jewellers
98e39236-a9fd-413f-9a9e-022d36809849 · Oct 27
£10,252 GBP
$13,737 USD
View
23 more retailers have this diamond
Prices start from £4,843 GBPSave up to £5,409 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
£4,843 GBP