Kezhart, these are ceramic mosaics from here-
If budget allows, you can get nicer ones in marble here - https://designermarble.com.au/collections/nero-marquina
(the 50mm size)
Alternatively, we also have the goods if you are unable to find what you need from those other sources.
Hope that helps!
Kitchen splash back
Ugly back of house and garden, and ive no idea where to start
I love this bathroom by GIA...does anyone know what tiles in use?
Kitchen splash back tiles - help identifying?