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Round|Natural|GIA

1.09ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 6227528327

Certificate GIA 6227528327

Diamond specifications and retailer prices

From £4,005 GBP
As of October 30, 2026
Save £2,612 GBP (39%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £8,582 GBP at Diamond Quarter · As of October 29, 2026
View at Diamond Quarter

About this 1.09ct natural round diamond

This 1.09ct natural round sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6227528327. Listed at 7 retailers as of October 29, 2026, with a 65% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.09
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.5°
Pavilion angle41.6°
OriginNatural
Grading LabGIA
CertificateGIA 6227528327
Dimensions6.63 × 6.60 × 4.05 mm
L/W Ratio1.00
Star length50%
Lower girdle80%
Top View
6.63 mm6.60 mm1.09 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6227528327
Side View
Table 61.0%Crown 33.5°Girdle: MED-STKPavilion 41.6°Culet: NoneDepth 61.3%

Caratlytics Score

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

Price History

Last verified: Oct 30
Current: £4,005 GBP|Low: £3,340 GBP|High: £6,661 GBP|Avg: £4,632 GBP|+1.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
October 30, 2026
Retailer 4£3,340 GBP
Retailer 1£4,005 GBP
Retailer 5£4,139 GBP
Retailer 6£4,559 GBP
Retailer 2£4,689 GBP
Retailer 3£6,618 GBP

40 data points across 6 retailers

7 retailers£4,005 GBP to £6,618 GBP

Retailer 1
-
£3,340 GBP
$4,475 USD
Price last confirmed 12 days ago
B+
Retailer 2
-
£4,005 GBP
View
Retailer 3
-
£4,139 GBP
A$8,533 AUD
View
Price last confirmed 20 days ago
Retailer 4
-
£4,559 GBP
$6,109 USD
View
Price last confirmed 7 days ago
B
Retailer 5
-
£4,689 GBP
€5,983 EUR
View
B
Retailer 6
-
£6,618 GBP
View
Most Expensive
Diamond Quarter
1.09SI1E62272A43N · Oct 29
£8,582 GBP
View
Price under review
6 more retailers have this diamond
Prices start from £4,005 GBPSave up to £2,612 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+
1.09ct Round
£4,005 GBP