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Round|Natural|GIA

1.23ct G SI1 Round Natural Diamond

EX • G/SI1 • GIA 2557335290

Certificate GIA 2557335290

Diamond specifications and retailer prices

From £3,099 GBP
As of November 4, 2026
Save £2,430 GBP (44%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £5,529 GBP at Wholesale Diamonds Direct · As of November 6, 2026
View at Wholesale Diamonds Direct

About this 1.23ct natural round diamond

This 1.23ct natural round sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by GIA 2557335290. Listed at 14 retailers as of November 4, 2026, with prices from £3,099 to £5,529, a £2,430 spread on the same certified stone. Wholesale Diamonds Direct lists it at £5,529. 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
G
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle41°
OriginNatural
Grading LabGIA
CertificateGIA 2557335290
Dimensions6.83 × 6.86 × 4.24 mm
L/W Ratio1.00
Culet sizeNone
Key to symbols
Crystal, Needle
Top View
6.83 mm6.86 mm1.23 ctG / SI1
OriginNatural
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateGIA 2557335290
Side View
Table 59.0%Crown 36°Girdle: MED-STKPavilion 41°Culet: NoneDepth 62.0%

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 4
Current: £3,852 GBP|Low: £3,355 GBP|High: £4,821 GBP|Avg: £3,971 GBP|-0.1%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
November 7, 2026
Retailer 6£3,355 GBP
Retailer 7£3,656 GBP
Retailer 5£3,761 GBP
Retailer 1£3,852 GBP
Retailer 4£4,042 GBP
Retailer 3£4,298 GBP
Retailer 2£4,786 GBP

42 data points across 7 retailers

14 retailers£3,099 GBP to £5,529 GBP

B+
Cheapest Retailer
-
£3,099 GBP
B+
Retailer 2
-
£3,355 GBP
View
B+
Retailer 3
-
£3,656 GBP
View
B
Retailer 4
-
£3,748 GBP
View
B
Retailer 5
-
£3,761 GBP
View
B+
Retailer 6
-
£3,852 GBP
View
B
Retailer 7
-
£3,990 GBP
View
B
Retailer 8
-
£3,990 GBP
View
B
Retailer 9
-
£4,030 GBP
View
B
Retailer 10
-
£4,042 GBP
View
B
Retailer 11
-
£4,124 GBP
View
B
Retailer 12
-
£4,298 GBP
View
B
Retailer 13
-
£4,786 GBP
View
Most Expensive
B
Wholesale Diamonds Direct
246422210 · Nov 6
£5,529 GBP
$7,401 USD
View
13 more retailers have this diamond
Prices start from £3,099 GBPSave up to £2,430 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
£3,099 GBP