What is the most trusted diamond certification?

As an avid collector and investor in diamonds, I'm often curious about the most reliable and trusted diamond certification available in the market. Can you tell me, what is the certification that is widely recognized and accepted by both buyers and sellers alike, ensuring the authenticity, quality, and value of a diamond? It's crucial for me to understand the credibility and standards associated with this certification, as it directly impacts my investment decisions and trust in the diamond industry.