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Round|Lab Grown|IGI

1.25ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG770644121

Shape and cutting style on the report: Round brilliant

Certificate IGI LG770644121

Diamond specifications and retailer prices

From £483 GBP
$650 USD
As of November 5, 2026
1 retailer carries this diamond
Only listing: £483 GBP at Brilliant Earth
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Brilliant Earth

About this 1.25ct lab-grown round diamond

This 1.25ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG770644121 or 770644121. Listed at a single retailer as of November 5, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. 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

1.25
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG770644121
Dimensions6.98 × 7.01 × 4.18 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.98 mm7.01 mm1.25 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG770644121
Side View
Table 60.0%Crown 34°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 59.8%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 5
Current: £483 GBP|Low: £168 GBP|High: £570 GBP|Avg: £365 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
April 14, 2026
Retailer 8£262 GBP
Retailer 3£270 GBP
Retailer 2£291 GBP
Retailer 4£386 GBP
Retailer 6£391 GBP
Retailer 5£472 GBP
Brilliant Earth£483 GBP
Retailer 7£570 GBP

25 data points across 8 retailers

1 retailer

B
Brilliant Earth
18208538A · Nov 5
£483 GBP
$650 USD
View

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
1.25ct Round
£483 GBP