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Oval|Natural|GIA

1.51ct H SI1 Oval Natural Diamond

EX • H/SI1 • GIA 1548486476

Certificate GIA 1548486476

Diamond specifications and retailer prices

From £3,515 GBP
₹448,505 INR
As of October 31, 2026
Save £946 GBP (21%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £4,461 GBP at Blue Nile · As of October 31, 2026
View at Blue Nile

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 1548486476. Listed at 7 retailers as of October 31, 2026, with prices from £3,515 to £4,461, a £946 spread on the same certified stone. Blue Nile lists it at £4,461. 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
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 1548486476
Dimensions9.07 × 6.46 × 4.09 mm
L/W Ratio1.40
Culet sizeNone
Key to symbols
Crystal, Feather, Needle
Top View
9.07 mm6.46 mm1.51 ctH / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1548486476
Side View
Table 57.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 63.4%

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: Oct 31
Current: £4,461 GBP|Low: £3,435 GBP|High: £4,934 GBP|Avg: £3,943 GBP|-9.6%
Blue Nile
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
October 31, 2026
Retailer 2£3,515 GBP
Retailer 4£3,601 GBP
Retailer 7£3,780 GBP
Retailer 6£3,906 GBP
Retailer 3£4,003 GBP
Retailer 5£4,052 GBP
Blue Nile£4,461 GBP

39 data points across 7 retailers

7 retailers£3,515 GBP to £4,461 GBP

A
Cheapest Retailer
-
£3,515 GBP
₹448,505 INR
A
Retailer 2
-
£3,601 GBP
$4,825 USD
View
A
Retailer 3
-
£3,780 GBP
$5,065 USD
View
A
Retailer 4
-
£3,906 GBP
$5,233 USD
View
Final sale: no returns
A
Retailer 5
-
£4,003 GBP
View
B+
Retailer 6
-
£4,052 GBP
SGD 7,336 SGD
View
Most Expensive
B+
Blue Nile
27966075 · Oct 31
£4,461 GBP
$5,977 USD
View
6 more retailers have this diamond
Prices start from £3,515 GBPSave up to £946 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
£3,515 GBP