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Round|Natural|GIA

1.23ct I SI2 Round Natural Diamond

EX • I/SI2 • GIA 6552654575

Certificate GIA 6552654575

Diamond specifications and retailer prices

From £2,099 GBP
A$4,327 AUD
As of October 31, 2026
Save £844 GBP (29%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £2,943 GBP at 77 Diamonds · As of October 31, 2026
View at 77 Diamonds

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded I colour (near-colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by GIA 6552654575. Listed at 5 retailers as of October 31, 2026, with prices from £2,099 to £2,943, a £844 spread on the same certified stone. 77 Diamonds lists it at £2,943. 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
I
Colour
SI2
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.8°
OriginNatural
Grading LabGIA
CertificateGIA 6552654575
Dimensions6.83 × 4.26 × 4.26 mm
L/W Ratio1.60
Culet sizeNone
Top View
6.83 mm4.26 mm1.23 ctI / SI2
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 6552654575
Side View
Table 57.0%Crown 36°Girdle: MED-STKPavilion 40.8°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 31
Current: £2,943 GBP|Low: £1,724 GBP|High: £3,086 GBP|Avg: £2,348 GBP|+50.7%
77 Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 31, 2026
Retailer 10£1,724 GBP
Retailer 9£1,767 GBP
Retailer 3£1,889 GBP
Retailer 11£2,050 GBP
Retailer 2£2,099 GBP
Retailer 8£2,362 GBP
Retailer 7£2,374 GBP
Retailer 4£2,381 GBP
Retailer 6£2,425 GBP
Retailer 5£2,887 GBP
77 Diamonds£2,943 GBP
Retailer 12£3,058 GBP

21 data points across 12 retailers

5 retailers£2,099 GBP to £2,943 GBP

A
Cheapest Retailer
-
£2,099 GBP
A$4,327 AUD
B+
Retailer 2
-
£2,255 GBP
$3,022 USD
View
B+
Retailer 3
-
£2,425 GBP
CA$4,514 CAD
View
B
Retailer 4
-
£2,887 GBP
€3,684 EUR
View
Most Expensive
B
77 Diamonds
RBMBE2RGKPUG · Oct 31
£2,943 GBP
View
4 more retailers have this diamond
Prices start from £2,099 GBPSave up to £844 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
£2,099 GBP