Nourbel & Le Cavelier is based in London; they sell beautiful jewels, judging from their web site. If you want detailed information, you will have to visit or contact them.
These delightfully mismatched earrings are, in their (succinct) words, “A pair of Micromosaics set with diamonds, Tourmalines and Tanzanites. One of a kind piece. Nada Roma exclusive design.”
Pretty. And no doubt pricey.