Bs
Jewellery Store
https://www.ebay.co.uk/str/bennettsjewellerystore
UK Seller
Natural Unique & Beautiful Agate Gemstones with a 925 Silver 20in Necklaces
Sold in Black Gift Plastic Boxes
They are commonly know as Agate,
common
semiprecious mineral
that
occurs in bands of varying colour and transparency.
Agate
is essentially quartz,
and
its physical properties are in general those of that mineral.
Thanks for looking