Tun - If the specifics of the gold carat and purity is less of an issue and you want something very Singapore in design and nature but still gold - then I'd recommend looking at Risis - amongst other items they electroplate orchids, then gold plate them (or Rhodium plate or a mix of the two).
Yes its plated not solid so for those wanting solid gold this is not suitable, but the fact each is an individual flower does mean each piece is technically unique due to the small varations from flower to flower.
There website is here (the orchids Im talking about are in the natural insprations section - there are other orchid jewllrey types on the website but its the natural inspiration set that contain real flowers under the plate.
They have shops in a number of malls, in the airport and also the main place my wife ends up plundering - the outlet at the entrance to the National Orchid Garden. As you can tell from the website they also do a variety of other items that may also interest.....