Voldemort creates a replacement Horcrux for Diary?

[Eddie]

No: HPFGUIDX 171560

Since Voldemort presumably wants 7 soul bits (6 horcruxes + 1 soul bit
in himself) and he knows the diary's horcrux was destroyed, wouldn't
he have created a horcrux to replace the diary?  If not, why not?

Methinks Harry may have one MORE horcrux to destroy than he realizes.
 At the same time, Voldemort has one FEWER horcruxes remaining than he
realizes (since the ring is destroyed).

Eddie