Round|Natural|GIA

1.23ct E SI1 Round Natural Diamond

EX • E/SI1 • GIA 1236874082

Certificate GIA 1236874082

Diamond specifications and retailer prices

From £3,180 GBP
As of November 3, 2026
Save £2,173 GBP (41%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £5,856 GBP at NZ Jewellers · As of September 28, 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 1236874082. Listed at 9 retailers as of November 2, 2026, with a 68% 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
FluorescenceNone
Crown angle36°
Pavilion angle41.2°
OriginNatural
Grading LabGIA
CertificateGIA 1236874082
Dimensions6.81 × 6.85 × 4.28 mm
L/W Ratio1.01
Girdle conditionMedium
Key to symbols
Crystal, Feather, Needle
Top View
6.81 mm6.85 mm1.23 ctE / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 1236874082
Side View
Table 58.0%Crown 36°GirdlePavilion 41.2°CuletDepth 62.7%

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: Nov 3
Current: £3,233 GBP|Low: £3,180 GBP|High: £5,418 GBP|Avg: £3,799 GBP|-1.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 2, 2026
Retailer 4£3,180 GBP
Retailer 1£3,233 GBP
Retailer 3£3,388 GBP
Retailer 6£3,543 GBP
Retailer 5£3,592 GBP
Retailer 7£3,846 GBP
Retailer 2£5,352 GBP

34 data points across 7 retailers

9 retailers£3,180 GBP to £5,352 GBP

B+
Cheapest Retailer
-
£3,180 GBP
B+
Retailer 2
-
£3,233 GBP
View
Retailer 3
-
£3,361 GBP
View
Price last confirmed 44 days ago
Retailer 4
-
£3,361 GBP
View
Price last confirmed 29 days ago
Retailer 5
-
£3,361 GBP
View
Price last confirmed 38 days ago
Retailer 6
-
£3,388 GBP
View
Price last confirmed 28 days ago
B
Retailer 7
-
£5,352 GBP
View
Retailer 8
-
£5,856 GBP
View
Price last confirmed 46 days ago
Most Expensive
NZ Jewellers
592b55dd-38c2-4ef5-bb14-41c224b1515c · Sep 28
£5,856 GBP
$7,881 USD
View
Price last confirmed 38 days ago
8 more retailers have this diamond
Prices start from £3,180 GBPSave up to £2,173 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
£3,180 GBP