(piece of) diamond jewellery

It's JEWELRY, not jewellery. "Piece of" is optional. When you say "30% of", it could conceivably be interpreted as "If you buy a diamond we will give you 30% of the price of a Movado watch as a bonus" (i.e. you don't actually have to buy a watch, we're giving you extra money for buying the diamond). I don't think that's what you have in mind at all. Better say "30% OFF".

"Jewelry" is US English spelling, "jewellery" is the correct British English spelling. I understand that Tanguatlay chooses to use BrE spelling and other conventions.

"Piece of diamond jewellery" is a good choice. You should use "off" when referring to discounts.

weird. I'll accept the spelling, Contrex. I've read a lot of Brit stuff and never seen that, or at least never consciously noted it, but the dictionary does say "chiefly British, variant." Don't you guys resent the almost 30% longer it takes you to write it?

It's worth it if it prevents people thinking we are Americans... They spell it that way in Canada too.

That must be an American dictionary you consulted, because from where I'm sitting, "jewelry" is a "chiefly US variant".

"Two great peoples, divided by a common language."--W. Churchill

This is off-topic.

Did the British teach American English? I have been told that Americans were migrants from the UK. Correct me if I am wrong.

Thanks in advance.

Emigrants. Migrants implies we were planning on moving around alot, once we got here. We intended no such thing, nor had we plans to return.

Thanks, Roger.

I would like to know whether the British taught the Americans English.

Many thanks.

Most of the early migrants into the area that became the United States were English or Scotch or Welsh (and later Irish). They spoke English. It's not so much "Did the British teach Americans English". It's rather they were Brits, and they were here, and they spoke. And their kids learned from them. And immigrants from other countries who came learned from what were by then native English speakers. Over the course of time, the varieties of English spoken on either side of the ocean developed local differences in accent, vocabulary, spelling, and to a small degree grammar.

Thanks to all who have helped me.

Thanks, Jack, for the information about Americans.