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Round|Lab Grown|IGI

1.23ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG660459723

Certificate IGI LG660459723

Diamond specifications and retailer prices

From £444 GBP
As of November 6, 2026
Save £181 GBP (29%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £624 GBP at Zales · As of November 4, 2026
View at Zales

About this 1.23ct lab-grown round diamond

This 1.23ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG660459723 or 660459723. Listed at 3 retailers as of November 4, 2026, with prices from £444 to £624, a £181 spread on the same certified stone. Zales lists it at £624. 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
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
OriginLab Grown
Grading LabIGI
CertificateIGI LG660459723
Dimensions6.80 × 6.85 mm
L/W Ratio1.01
Top View
6.80 mm6.85 mm1.23 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG660459723
Side View
Table 56.0%CrownGirdle: MED-STKPavilionCulet: NoneDepth 62.3%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 6
Current: £444 GBP|Low: £444 GBP|High: £996 GBP|Avg: £778 GBP|-55.4%
Retailer 1
Retailer 2
Zales
November 6, 2026
Retailer 1£444 GBP
Retailer 2£624 GBP
Zales£624 GBP

8 data points across 3 retailers

3 retailers£444 GBP to £624 GBP

B
Cheapest Retailer
-
£444 GBP
B
Retailer 2
-
£624 GBP
View
Most Expensive
B
Zales
524116910 · Nov 4
£624 GBP
$840 USD
View
2 more retailers have this diamond
Prices start from £444 GBPSave up to £181 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
£444 GBP