These earrings contain natural Tanzanite gemstones measuring 4x5mm. This bracelet is 925 sterling silver and platinum plated, also available in gold or rose gold plating (16cm in length + 4cm for adjustment). Please send a message for customization requests. This item includes a gift box and a certificate of authenticity with purchase. This item is made to order, please allow up to 10-15 days for processing and delivery of this item.