Lucien Arkas art Gallery is a cultural building in Urla, İzmir, Türkiye by Artı3 Mimarlık, from 2019. Museums and cultural centers are where stone specification gets conservative in a good way — the material is chosen to outlast the exhibitions it houses. To be clear: this is not a DIJA project, and we did not supply the material — it is included here purely as a documented reference.
The published record specifies the following material use: facades:: limestone (demre, antalya); platform floors and stairs:: marble (şakirkarağaç, isparta).
For limestone (demre, antalya), we do not carry that exact quarry block, but a very close relative is Pietra Leccese. For marble (şakirkarağaç, isparta), the nearest equivalent we stock is Calacatta Oro.
The architect's own account, and the photography that goes with it, is one click away at the source link.