What does numbers than Taiwan Ed00 stamped on a ring mean?

The "ED00" stamped on a ring likely indicates that the item was made in Taiwan and can denote the year of production, which in this case would be 2000. The "ED" prefix may refer to a specific manufacturer or brand. Manufacturers often use such markings for quality control and identification purposes. If you're looking for more specific details, consulting the brand or manufacturer directly would be beneficial.