Hi Alex --
I'm glad to try to help. There seem to be a fair number of pre-1918 Russian items in Australia: I'm not entirely sure why. A few years back, I bought a couple of IPF Order Plates (19th century additions to the original 18th century Gardner services) on eBay from an Australian seller. Sadly, such finds are not around any longer.
However, your Gardner porcelain for the Islamic market turns up on eBay & elsewhere from time to time. I found a plate matching your items in Inverness, Scotland, about 12 years ago, probably because many Scottish women went to Russia as governesses in the late 19th-early 20th centuries. Good LucK!
TATYANA