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Round|Natural|GIA

1.23ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 2136111141

Certificate GIA 2136111141

Diamond specifications and retailer prices

From £6,003 GBP
As of November 1, 2026
Save £2,339 GBP (28%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £11,123 GBP at NZ Jewellers · As of November 5, 2026
View at NZ Jewellers

About this 1.23ct natural round diamond

This 1.23ct 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 2136111141. Listed at 13 retailers as of November 1, 2026, with a 39% 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

1.23
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
Crown angle33.5°
Pavilion angle41.4°
OriginNatural
Grading LabGIA
CertificateGIA 2136111141
Dimensions6.94 × 6.92 × 4.18 mm
L/W Ratio1.00
Culet sizeNone
Top View
6.94 mm6.92 mm1.23 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 2136111141
Side View
Table 61.0%Crown 33.5°Girdle: MED-STKPavilion 41.4°Culet: NoneDepth 60.3%

Caratlytics Score

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B
Good
Decent quality, room for better deals
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £11,123 GBP|Low: £5,890 GBP|High: £11,123 GBP|Avg: £8,026 GBP
NZ Jewellers
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 6£6,003 GBP
Retailer 4£6,310 GBP
Retailer 7£6,674 GBP
Retailer 2£7,249 GBP
Retailer 8£7,341 GBP
Retailer 3£8,039 GBP
Retailer 5£10,423 GBP
NZ Jewellers£11,123 GBP

40 data points across 8 retailers

13 retailers£6,003 GBP to £8,342 GBP

B
Cheapest Retailer
-
£6,003 GBP
B
Retailer 2
-
£6,310 GBP
View
B
Retailer 3
-
£6,674 GBP
View
Final sale: no returns
B
Retailer 4
-
£7,230 GBP
View
B
Retailer 5
-
£7,249 GBP
View
B
Retailer 6
-
£7,341 GBP
View
B
Retailer 7
-
£7,943 GBP
View
B
Retailer 8
-
£7,943 GBP
View
B
Retailer 9
-
£8,039 GBP
View
B
Retailer 10
-
£8,203 GBP
View
B
Retailer 11
-
£8,342 GBP
View
Retailer 12
-
£10,423 GBP
View
Price under review
Most Expensive
NZ Jewellers
d468309c-1b94-4227-b591-484861551621 · Nov 5
£11,123 GBP
$14,971 USD
View
Price under review
12 more retailers have this diamond
Prices start from £6,003 GBPSave up to £2,339 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
1.23ct Round
£6,003 GBP