"Create two logo samples for a company named CDK that specializes in synthetic diamond production using hot filament CVD technology. One logo should feature only the text 'CDK' in a single color, and the other logo should include an illustration subtly related to hot filament CVD technology. Keep the design minimalistic and use a restrained color palette such as black, dark red, or dark blue. Ensure the illustration is not overly dominant and subtly convey the hot filament element. Limit the complexity of the illustration to maintain a clean and sophisticated look."