Thanks, Stefany. That's very helpful. I can see I have a lot to learn about coral! This is lesson #1, but I shall need a few more, I'm sure. Fortunately, it cost me nothing, and I like the style of the necklace; I'll find a friend to give it to. I haven't yet found a similar silver pendant, but I shall keep looking. It's an unusual shape.

Here, incidentally, is the Vietnamese enamelled polychrome jar that got me into this.

All the best,

Will