https://www.gemsofeastafrica.com/products/umba-sapphire-4-18ct-umba-valley-tanzania-untreated-unheated-vs 2026-07-10T21:19:58+01:00 daily https://cdn.shopify.com/s/files/1/0087/4440/3008/files/IMG_0412_86915aaa-0fef-48bc-9155-38b40dfad80e.jpg?v=1783709391 Umba Sapphire, 4.18ct, Umba Valley, Tanzania, Untreated Unheated. vs