RARE Pietersite (Tempest Stone) Necklace Hallmarked

Rare Pietersite or Tempest stone originates from Namibia. Hallmarked and set in gold tone, this gorgeous necklace is in like new condition. Classic C-clasp with multiple extensions makes this a very versatile piece. Total chain length 21” Stone 1”x 1/2” The Hallmark is very small and very hard to see and photograph. it does have what it looks like a shield with a word underneath. But even with a high magnified jewelers loop I am unable to make it out