I think the largest disclosed un-certified gem right now is a 155 carat diamond. Which, sure, it’s a big gem. But if it was possible to make unreasonably large gems, we’d be seeing one-piece emerald kitchen counter slabs on the market right now and people with enough means would be making gemstone windows.
So, why is the largest synthetic gemstone still ‘only’ palm-sized? Is it a matter of scaling the size of equipment? The cost of materials? Some inherent fragility in the gems once they reach a certain size?
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Define “Gem”
Lab grown sapphire blocks can be as big as a brick and commonly used for viewport protectors as it does not scratch easily
Lab grown ruby rods are used in lasers and can be as thick as my wrist.
Lab grown diamonds have their uses too, but those applications are usually small, so lab grown diamonds are also usually small.
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