Modern vintage choker and brooch with ROSS engraving, leaf motif *New photos

I found new brooches for the series, so I've put them together as a set. The choker part was also found. It seems a little warped, but looking at the last photo, it doesn't seem so, so it might have been made that way originally.
There is a modern leaf-shaped top and a brooch/top that is similar but has a clasp on the back.
Upon closer inspection, the design and color are slightly different. The brooch has a mix of gold and color. There are no metal hallmarks, so it is likely silver-plated with faux pearls. (Since the pearls are uncertain, I will list them as faux pearls.)
Both pieces have the manufacturer's hallmark, ROSS + swirl mark, commonly found on costume jewelry from the 1970s-1990s, on the back.
The size is very large and elongated, weighing 13g.
The top-only piece measures 11 cm in length and just under 2.5 cm in width. The brooch is 12.5 cm long, slightly longer.
This is a used item, so please excuse minor scratches and scuffs.