Celtic Knob in antique pewter with blue sodalite semi-precious stone 1-3/8" diameter Product Specification: Made in the USA. Fine-art foundry hand-pours and hand finished hardware knobs and pulls using Old World methods. Lifetime guaranteed against flaws in craftsmanship. Exceptional clarity of details and depth of relief. All knobs and pulls are hand cast from solid fine pewter or solid bronze. The term antique refers to special methods of treating metal so there is contrast between relief and recessed areas. Knobs and Pulls are lacquered to protect the finish. Alternate finished are available. Blue Sodalite Semi-Precious stone. Blue Sodalite is a royal blue colored stone that usually has some white or gray-colored streaks. Blue Sodalite looks a bit more crystal-like. It was named by Professor Thomas Thompson who was called in to identify the specimen that was brought from Greenland to Denmark during the time of the Napoleonic wars - he identified it at first as Sodium Aluminum Silicate Chloride. The stone is associated with the Astrological sign Sagittarius and is thought to promote focus clearing mediation and calming of fears.