What would be the chemical composition of the crust and core of a planet comprised primarily of diamond?

I'm creating a world for a webcomic and I'm running into some difficulties "“ namely, my own limitations. I'm not a scientist, and I don't even know how to start asking the questions I want answered. Anyhow, here are the specs for my system;

My planet Liskuel orbits Kereiol, a 2 billion year old quiescent carbon-rich M star with a temperature of 3,100 kelvins and 40% of the sun's mass. If it flares at all they are tiny. It has four orbiting planets, only one of which, Liskuel, is within the goldilocks zone. Liskuel is 0.15 AU from Kereiol and has an orbital period of 35 days.

Liskuel is a tidally locked wet, rocky carbon-born planet with an active core. The surface is 70% covered by deep water and 30% dry land. It is 1.5 times the size of earth with a surface area of 1147.5 million square km, but with a similar mass and gravity to earth.

This is because, unlike our planet which is dominated by oxygen and silicates, Liskuel is rich in aluminium, titanium, silicon, carbon, and lithium and mostly comprised of quartz or diamond. (For aesthetic reasons, mostly. Webcomic!)

Is this premise possible?

Cheers!

posted over 5 years ago

MissMermaid‭

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