I had to pop into your thread and post this DBTY we just shipped - rose gold with rubies. The rubies are set into white gold bezels as that is how the setting comes standard for diamonds, but it gives you the idea.
Sorry but I''m not keen. I don''t think that the colour of the Ruby is enhanced with rose gold but that''s just my personal opinion. However, if it is set in white or yellow gold and then there''s rose gold elsewhere it does work (like the necklace posted by Whiteflash).
For me it would depend on the shade of red in the ruby. I would think a more purple-ish one would be pretty in rose gold, but I don''t know about a more orangey one.
i think it''s a fabulous combo! that necklace is TDF! it''s so modern and cool, but also looks like your grandmother could''ve passed it down as priceless heirloom. love it!