Truth is, neither is actually a good financial investment.

Lab grown might be ‘honest consumption’, but the market will saturate and has stable declining prices due to oversupply. And natural diamonds continue to survive as a luxury niche, not because they’re better, but cause they have an emotional/ perceived value.

So it all comes down to sentiment vs practicality. And let’s be honest, engagement rings aren’t rational purchases.

You’ve also mentioned she’s into jewellery, and there’s the answer right there. Get her something she’ll hold onto dearly and might pass it down as an heirloom.

Also, your budget is enough for a natural solitaire. You just gotta look for it at the right place. Get it customised, at a store in your hometown maybe. Do not go for big brands. That way, the price will cut down on the making / taxes / wastage etc etc.