Aurora is chain of gold shops. Staff here speaks English well. They have shops across Thailand. Mostly they are located within Big C and Lotus building. So just search on Google map `Aurora near me`. I have purchased many items from Aurora, staff were professional and friendly.

YKT is another chain based gold shops across Thailand. Staff here speaks English well. Mostly they are located within Big C and Lotus building. Normally Aurora and YKT are next to each other.

In genral Big C and Tesco buildings does have multiple types of business. It is highly likey you will find atleast one gold jewelry shop in same building.

MBL mall Bangkok is located right next to BTS National stadium. MBK mall 3rd floor have lot of of gold and diamond jewelry shops. Since MBk is touristic area, communication is not a problem. Staff here speaks English very well.

Here communication could be a problem. Most of the staff in these shops does not speak English. Most of the shops I have been, it was very crowded. And staff were not so keen on showing the jewelry. It is hit or miss. There are many gold jewelry shops in Yaorawat Road China town Bangkok. As you walk by you will notice them. Feel free to explore the area. As a thumb rule, go to shop where locals go. It will be crowded.

Apart from these, there are plenty of gold jewelry shops across Thailand. Just search on Google map in Thai. But they may not speak english very well.