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Oval|Natural|GIA

1.00ct E SI1 Oval Natural Diamond

EX • E/SI1 • GIA 1558951120

Certificate GIA 1558951120

Diamond specifications and retailer prices

From £1,650 GBP
SGD 2,970 SGD
As of October 29, 2026
Save £1,430 GBP (46%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £3,080 GBP at Helzberg Diamonds · As of October 30, 2026
View at Helzberg Diamonds

About this 1ct natural oval diamond

This 1ct natural oval sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA 1558951120. Listed at 14 retailers as of October 29, 2026, with prices from £1,650 to £3,080, a £1,430 spread on the same certified stone. Helzberg Diamonds lists it at £3,080. 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

1.00
Carat
E
Colour
SI1
Clarity
Excellent
Cut (retailer stated)

Specifications

Cut (retailer stated)Excellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle39.81°
Pavilion angle40.7°
OriginNatural
Grading LabGIA
CertificateGIA 1558951120
Dimensions7.89 × 5.68 × 3.54 mm
L/W Ratio1.39
Culet sizeNone
Top View
7.89 mm5.68 mm1.00 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 1558951120
Side View
Table 61.0%Crown 39.81°Girdle: THN-THKPavilion 40.7°Culet: NoneDepth 62.3%

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 29
Current: £3,080 GBP|Low: £1,650 GBP|High: £3,275 GBP|Avg: £2,229 GBP|-5.9%
Helzberg Diamonds
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
October 30, 2026
Retailer 12£1,650 GBP
Retailer 10£1,762 GBP
Retailer 11£1,781 GBP
Retailer 13£1,793 GBP
Retailer 9£1,832 GBP
Retailer 7£1,932 GBP
Retailer 5£1,951 GBP
Retailer 14£2,111 GBP
Retailer 4£2,207 GBP
Retailer 2£2,248 GBP
Retailer 8£2,308 GBP
Retailer 6£2,732 GBP
Retailer 3£2,952 GBP
Helzberg Diamonds£3,080 GBP

32 data points across 14 retailers

14 retailers£1,650 GBP to £3,080 GBP

A
Cheapest Retailer
-
£1,650 GBP
SGD 2,970 SGD
A
Retailer 2
-
£1,762 GBP
$2,346 USD
View
A
Retailer 3
-
£1,781 GBP
$2,372 USD
View
A
Retailer 4
-
£1,793 GBP
$2,387 USD
View
A
Retailer 5
-
£1,832 GBP
$2,440 USD
View
A
Retailer 6
-
£1,932 GBP
View
A
Retailer 7
-
£1,951 GBP
SGD 3,511 SGD
View
A
Retailer 8
-
£2,111 GBP
$2,811 USD
View
A
Retailer 9
-
£2,207 GBP
$2,939 USD
View
B+
Retailer 10
-
£2,248 GBP
$2,994 USD
View
B+
Retailer 11
-
£2,308 GBP
€2,927 EUR
View
B+
Retailer 12
-
£2,732 GBP
$3,638 USD
View
B+
Retailer 13
-
£2,952 GBP
$3,932 USD
View
Most Expensive
B+
Helzberg Diamonds
XZRHLLOPLHHIG · Oct 30
£3,080 GBP
$4,102 USD
View
13 more retailers have this diamond
Prices start from £1,650 GBPSave up to £1,430 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
1.00ct Oval
£1,650 GBP