Identify Zener diode
Unless you get lucky and find a whole part number (as in the 1N4148), you're better off measuring.  Get a 20 V supply or so and a 2 k&Omega; resistor.  Most diodes (other than LEDs, but that's not the issue here) aren't going to be damaged with either 20 V reverse voltage or 10 mA thru them either way.

Connect the 20 V with the 2 k&Omega; in series to each diode and measure the voltage.  With the + to the anode and - to the cathode (striped end), all the diodes should measure around 700-800 mV.  If a diode measures 20 V that way, then it's blown.  If it measures about half that, then it's a Schottky and not a zener.

Now flip the diode around and measure the voltage again.  This will show you the Zener voltage.  Put them in bins accordingly.  If a diode measures the full 20 V, then it's either not a Zener (like the 1N4148), or its Zener voltage exceeds 20 V (unlikely).