Okaaaaaaaaaay...........hmmmmm.....
Most studs are preformed and not made in this country, they are usually cast (poured in a mould) unless you get posh handmade jewellery like for example Dinny Hall's jewellery.
Also, where you get a stud and a dangle for example, like where you would have a silver ball/gem/crystal in your ear and then hanging below it a further gemstone is very easy to do - any idea what sort of colours you would like?
QVC jewellery online is very inexpensive but their gemstones on silver I can make extremely cheap so I could copy anything you saw. Do you have a new Boden catalogue? There is a tumbled rose quartz necklace in there for £69 which I thought was lovely - its approx 120 carats of tumbled quartz - i made it last week for £14