https://i.imgur.com/sJA0bGX.png:)
A blood ring is typically crafted for the Bonus to Str and Bonus to Life (rares can only get 40 and 20 respectively). The Life Leech, as commented, is inbuilt, and irrelevant, but cannot be replaced.
This ring, crafted perfectly, would be 10fcr, 3LL, 60 Life 90 mana and 25 str (no additional mods available).
4 Str + 7 Life off perfect. The only complaint some users would have is Mana, where they would look for a different mod.
2nd this.