"Create a minimalistic and simple logo for a company named CDK that specializes in synthetic diamond production using hot filament CVD technology. The logo should be sleek and modern, similar to high-end jewelry brands like Tiffany & Co. or Cartier. Use a single color such as black, dark red, or dark blue. Avoid overly intricate diamond textures. Subtly incorporate the hot filament element in a very understated way. Provide two logo concepts in one image: one with an illustrative element and one with only the text 'CDK'."