Ruby: 160 main attribute, 320 accuracy, 320 parry.
Topaz: 320 attributes, 320 evasion, 320PVP toughness.
Sapphire: 320 hits, 320 spirit, 320PVP strength, 240 endurance.
According to common sense, green = yellow+blue, purple = red+blue, orange = red+yellow.
therefore
Emerald = half topaz+half sapphire, that is, one attribute of ruby is halved+one attribute of sapphire is halved together, and there are various combinations. For example, emeralds must have 160 pairs of attributes+160 to hit such gems.
The same is true of orange and purple gems.
Similarly, yellow gems can also be set in yellow grooves, namely topaz, emerald (yellow blue) and orange gem (yellow red).
The same is true for other grooves.