1 normal beryle=1 normal=-5% damage
10 normal beryle=1 refined= –10% damage
300 normal beryle=1 super gem= -15% damage
2–4 ep each

1 normal amethyst=1 normal=20% durability
10 normal amethyst=1 refined=50% durability
300 normal amethyst=1 super gem=100% durability
1–2 ep each

1 normal amber=1 normal= 1 pot
10 normal amber=1 refined= 3 pot
300 normal amber=1 super gem= 5 pot
5–8 ep each

1 normal citrine=1 normal=+5% attack
10 normal citrine=1 refined=+10% attack
300 normal citrine=1 super gem=+ 15% attack
1–2 ep each

1 normal sapphire=1 normal= +10% exp
10 normal sapphire=1 refined=+15% exp
300 normal sapphire=1 super gem= +25% exp
1–4 ep each

All gems can combine/embed by Charles at market 310 516.
but to embed the gems your equipment must have socket at least 1 soc.