Solid Sterling Monarch Opal Necklace created by Wildflowyr Jewelry. This one-of-a-kind drop necklace features a sparkling Monarch opal that glitters with teals, blues, reds and yellows. Each turn under the light reveals a different array of beautiful sparkling colors! I created the necklace from solid sterling silver, using this 14x10 drop cabochon, in which the 14x10 drop monarch opal fits securely. It hangs on a 30" adjustable wheat chain, exactly as pictured. Gift boxed with bow. A little more about Monarch opal: This cultured opal, as well as natural opal, are both created from particles of silica dioxide and water. However, monarch opal is grown, and it takes 4-6 months for the growing process to complete. This opal color comes from light refraction, NOT dyes. This opal has been classified by the GIA as a true synthetic opal.