Biomaterials are being investigated to produce platform as scaffolds for cell/tissue growth and differentiation/regeneration. Cell-materials, chemical and biological interactions enable the application of more functional materials in the area of bioengineering, providing a pathway to novel treatment of humans suffering from tissue/organ damage and facing limitation of donation organs. Many studies were done on the tissue/organ regeneration. Development of new scaffolds for cell/tissue regeneration is a key R&D field. This chapter focuses on describing R&D on the novel ultrananocrystalline diamond (UNCD) film as a unique biomaterial for scaffolds for developmental biology. Recent research showed that cells grown on the surface of UNCD-coated culture dishes are similar to cell culture dishes with little retardation, indicating UNCD films have no or little inhibition on cell proliferation and are potentially appealing as substrate/scaffold materials. The mechanisms of cell adhesion on UNCD surfaces are proposed based on the experimental results. The comparisons of cell cultures on diamond-powder-seeded culture dishes and on UNCD-coated dishes with matrix-assisted laser desorption/ionization - time-of-flight mass spectroscopy (MALDI-TOF MS) and X-ray photoelectron spectroscopy (XPS) analyses provided valuable data to support the mechanisms proposed to explain the adhesion and proliferation of cells on the surface of UNCD scaffolds.