The hair covering is called ''shaash'' shows that they are married women. Its a textile piece dyed bright dark colours usually.
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There is an entire thread on jewlery from collection by local Somali craftsmen and their names. I think the first picture the necklaces are called Labad(choker) and Kuul iyo Kadoon and the second picture the necklace is called Bisha cambarsheed
It's very interesting because you even see it from medieval to modern descriptions how much Somali women adorned jewelry This sentence is from Chinese 13th century
"The women's hair is coiled up, and yellow varnish makes [their] heads [shine] bright. From both ears hang cords with several round ornaments, round the neck they wear a silver ring, and necklaces hang down onto the breast."
But it has even greater significance economically because they constituted a women assets and wealth that were tradable. Even represented forms of savings during economic hardships and drove the trade and demand of it.