Also remember the 'Thai gold' bought in the shops in the malls is not the same purity as 24k gold. It's 23k.
No issue if you sell it in Thailand in the future, as it's a set price based on the current gold price per Baht, but if you want to sell it in another country, 24k gold is better.
If you buy the little gold bars in the malls, you often have to buy the dinky plastic box, as that's the profit for the shop. If you buy jewellery you pay for making on top of the current price. Making can be negotiable, or even free if you pay for "membership' at chains like Aurora.
If you want 24k gold, try Chinatown. If you want official gold coins like a UK Crown, Singapore is good. But Thai girls like Thai gold jewellery, so they can sell it after they dump you.
Long term Thai wives want Thai gold to sell after their husbands take a Gik.