Moonstone vs Swiss Blue Topaz: Which Gem Should You Pick? For quite a while, jewelry lovers have been enraptured by Swiss Blue Topaz because of its peaceful, purplish blue tone, which brings out pictures of quiet oceans and unadulterated skies. Its remarkable blue color makes a sensation of clearness and serenity, settling on it a famous decision for people searching for diamonds that tend to inward concordance and compatibility. Moonstone, on the other hand, is distinguished by its alluring adularescence, a gentle light that seems to flow over the gem as it moves.