Sara Blaine Willow House Enamel Silver Dangle Earrings

Rare Willow House by Sara Blaine. Elegant enamel blue and silver dangle earrings. Great Condition. Earrings have tested positive as Chalcedony. I can see SB WH, but I'm not seeing the typical 925 mark for sterling, therefore I'm not hitting it with acid because if they are plated, the Earrings are ruined. But, they feel, look and polish up like sterling. I've found no comps on these. I'm selling reduced because I'm not 100% sure. N24