Mixed-cut blue sapphires cast in organically shaped 18k yellow gold discs. Luxe studs for everyday wear. -0.375" Diameter. -0.5” post. Combining a background in sculpture with her training in fine art and jewelry at the Royal College of Art in London, UK-based artist Polly Wales utilizes a unique wax casting technique to create her one of a kind pieces that are perfectly imperfect, both rough and luxurious.