Firstly, the accessories!

As you might know, most people are right handed and wear their watch on the left hand. Here we can see Aventurine wears his watch on the right hand instead, which by itself doesn't mean much, but considering the rest of the evidence, does seem to add up to him being left-handed by nature (he might have taught himself to do things with the right hand to not stand out too much, but that's a subject for another rant)

You may also notice in that image that while his right hand is weighted with a number of accessories, his left hand is almost bare by comparison, this might indicate that he uses that hand more, so he needs it to be relatively light and unencumbered.

He also wears his dice/card case on his left thigh, within easy access of that hand.

And speaking of easy access!

On his normal attack, you can see that he throws the dice with the left hand and only after snaps his fingers with the right.

His follow up also uses his left-hand to snap his fingers

Finally with his burst he also throws the dice with the left hand. (He also snaps his fingers with his left hand on overworld attack animation, but I couldn't find a good gif so you can go check in-game or look it up lol)

Other details: The prayer to Gaiatra

you can see that while his sister uses her right hand, Kakavasha and Aventurine both use the left hand, this seemingly tiny detail was what really made me start this headcanon, because the contrast is very interesting.

And of course, we have to notice that it is his left hand which shakes and has to be hidden behind his back when he's nervous

He also uses it for different animations, here's his trailer, where he throws his hat with his left hand:

Here's the Non-zero-sum game trailer, where he uses his left for confidence:

In the infamous sleepwear image, he uses his left hand to answer his phone:

And finally! The Waveflair!

You can see that he once again leaves his left hand bare of adornments, while wearing various rings and bracelets on the right, and that he holds his glass with his left hand (he also holds his glass with the left in the non-zero-sum game trailer)

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