Hi, your listings would come up as Custom delivery if they were under £20 and you selected large letter, but obviously this would only insure you up to £20. You can select whatever you want delivery wise if under £20 on jewellery and watches.
I'm not a supporter of SD, but it would insure you better. I think the option to get a refund on SD is only if you select a tracked postage. I haven't tried it, but I read that you can edit price upwards after listing with custom postage by doing the quick edit on price (little pencil when you hover over this box)
