I am not very familiar with Thai jewelry, so I looked around a bit.
This seems to be the ruby and diamond necklace worn by Queen Sirikit:
http://soravij.com/jewels/royaljewel...kit/ruby03.jpg
The earrings are different, but Queen Suthida wore them previously, with a ruby and diamond buckle:
https://coconuts.co/wp-content/uploads/2019/05/A002.jpg
The emerald set, I only found this photo of the brooch:
https://www.abc.net.au/news/image/71...x2-940x627.jpg
I wasn’t able to find a photo of Queen Sirikit wearing the other emeralds. However, her jewelry collection is truly enormous. Just a quick google has turned up no less than 7 tiaras