Round|Natural|GIA

1.23ct M SI1 Round Natural Diamond

EX • M/SI1 • GIA 6365160641

Certificate GIA 6365160641

Diamond specifications and retailer prices

From £1,084 GBP
As of November 1, 2026
Save £903 GBP (45%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £3,563 GBP at NZ Jewellers · As of October 30, 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 M colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6365160641. Listed at 13 retailers as of November 1, 2026, with a 83% 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
M
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
OriginNatural
Grading LabGIA
CertificateGIA 6365160641
Dimensions6.82 × 6.78 × 4.26 mm
L/W Ratio1.01
Top View
6.82 mm6.78 mm1.23 ctM / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceFaint
CertificateGIA 6365160641
Side View
Table 58.0%CrownGirdlePavilionCulet: NoneDepth 62.6%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 1
Current: £3,563 GBP|Low: £1,007 GBP|High: £3,563 GBP|Avg: £1,660 GBP|+5.1%
NZ Jewellers
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
November 2, 2026
Retailer 8£1,084 GBP
Retailer 14£1,320 GBP
Retailer 11£1,412 GBP
Retailer 7£1,444 GBP
Retailer 5£1,461 GBP
Retailer 13£1,461 GBP
Retailer 3£1,490 GBP
Retailer 4£1,528 GBP
Retailer 12£1,563 GBP
Retailer 10£1,686 GBP
Retailer 9£1,795 GBP
Retailer 2£1,987 GBP
Retailer 6£2,246 GBP
NZ Jewellers£3,563 GBP

26 data points across 14 retailers

13 retailers£1,084 GBP to £1,987 GBP

A
Cheapest Retailer
-
£1,084 GBP
B+
Retailer 2
-
£1,320 GBP
View
B+
Retailer 3
-
£1,412 GBP
View
B+
Retailer 4
-
£1,444 GBP
View
B+
Retailer 5
-
£1,461 GBP
View
Retailer 6
-
£1,461 GBP
View
Price last confirmed 8 days ago
B
Retailer 7
-
£1,490 GBP
View
Retailer 8
-
£1,528 GBP
View
Price last confirmed 8 days ago
B
Retailer 9
-
£1,563 GBP
View
B
Retailer 10
-
£1,686 GBP
View
B
Retailer 11
-
£1,795 GBP
View
B
Retailer 12
-
£1,987 GBP
View
Most Expensive
NZ Jewellers
922048f7-14f0-4f67-93c2-cd5dfe544109 · Oct 30
£3,563 GBP
$4,796 USD
View
Price last confirmed 7 days ago
12 more retailers have this diamond
Prices start from £1,084 GBPSave up to £903 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
1.23ct Round
£1,084 GBP