Vintage Attwood and Sawyer (A&S) 22ct gold plated clear rhinestone lovers' knot brooch Alfred_Philippe One of their patents is

One of their patents is shown as the last photo in the listing

Wonderful vintage Art Deco brooch in silver tone with clear channel set rhinestones using the Schreiber and Hiller company's patented construction

But the slightly lower grade 900 parts per 1000 silver - commonly known as 'coin silver' - was often used in antique jewellery

and this seems the most likely designer in my view

and also some Kenneth Jay Lane pieces

Vintage Attwood and Sawyer (A&S) 22ct gold plated clear rhinestone lovers' knot brooch Alfred_Philippe One of their patents isFabulous vintage Attwood and Sawyer 22 carat gold plated and clear rhinestone encrusted reef knot brooch, signed with the A&S stamp on the reverse. This is a popular and very collectable design the lovely quality is apparent in the thick gold plating and good quality rhinestones. The piece is small (about 2 inches long) but has a good weight to it. it is in very good vintage condition. Founded in England in 1956 by Horace Attwood (Sawyer was a silent