October's birthstone is Opal (and tourmaline apparently). But the opal specifically has a superstition attached to it (is it a coincidence that Halloween is in October?) that goes something like: If you're not born in October and wear in particular, a white opal it's massive bad luck. Take your life in your hands people, or just stick to the stone assigned to you.
ZE: "Garnet - wank. The muddiest least romantic stone of them all."
HM: "In various books I've seen Pearl, Alexandrite and Aquamarine attributed to June. I love aquamarines and would be happy to accept a tiara in the same."
LC: "My birthstone is ruby - obviously ; ) Did you know that the official tone of ruby red is referred to as "pidgin blood"? I love & wear my earrings everyday."
HP: "I LOVE my birthstone which is turquoise but I actually don't own any. Over the years turquoise jewelry styles have been in and out such as Native American chunky stirling silver settings, etc. but what I'm really craving is a David Yurman gold set Sleeping Beauty turquoise cocktail ring which is timeless (and the price of my current rent)."