Yes, there are purebred Burmillas that have a shaded silver coat.
A purebred Burmilla have a shaded silver and golden coat.
Yes, a purebred Burmilla can have a tortoiseshell coat.
Yes, a purebred British Shorthair can have a shaded silver coat.
Yes, the purebred American Shorthair can have a shaded silver coat.
Yes, an American bobtail purebred can have a shaded silver coat.
Yes, the purebred American Curl can have a shaded silver coat.
Yes, a purebred Scottish Fold is known to have a shaded silver coat.
Yes, a purebred British Shorthair can have a shaded silver and white coat.
Yes, a purebred American Shorthair can have a shaded silver and white coat.
Yes, the purebred American Curl can have a shaded silver and white coat.
There are some purebred American Bobtail that have a shaded silver and white coat.
Yes, a purebred Burmilla can have a lilac coat. Many are blue and lilac.