Opal, Coral or Amber - Design of the new brooch

To create an unique and eye-catching new brooch I am going to use the following materials: stainless steel mesh, sterling silver wire and one gemstone. Which one of them should I use: opal, red coral or amber...

Opal's iridescent colours will beautifully complement the stainless steel mesh and sterling silver wire, red coral can add a pop of colour and vibrancy, while amber can bring warmth and earthiness to the design. Difficult choice...