Merkas Group Administrative Office, in İstanbul, is an office project credited to GIGoffice from 2018. We track workplace projects like this one for the same reason clients ask us about them: they want to know what still looks good after five years of daily use. 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.
Here is what the source material lists, application by application: seperators and structural wall coverings: gray marble; executive tables: black marble.
For gray marble, we do not carry that exact quarry block, but a very close relative is Bianco Carrara CD. For black marble, the nearest equivalent we stock is Nero Portoro.
For the complete photo set and the architect's own account of the project, see the source link below.