Three late 19th century - early 20th century diamond-set stick pins

Three late 19th century - early 20th century diamond-set stick pins, including a stick pin designed as two stylised acorns set with two untested pearls (possibly natural) with old-cut diamond-set cap and oak leaf in silver and gold, together with a similar stick pin designed as an acorn set with an untested pearl (possibly natural) with rose-cut diamond-set silver cap, and a diamond-set platinum wreath stick pin