Do you know why wedding rings are worn on the left finger?

Traditionally wedding rings are worn on the left ring finger because it was believed that the vein in that finger travels straight to the heart? Nowadays, the tradition still exists even though modern medical technology has proven the belief wrong. Another tradition is, after the ceremony, women transfer their engagement ring from the left hand to their right so they can wear the wedding ring on the left finger.

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"There are three things extremely hard: steel, a diamond, and to know one's self".
tacori | wedding rings

I have heard that before.
Pretty interesting.

The reason after put the ring on the third finger which believed had a vein, artery or nerve running directly to the heart.

really is it.
thanks a lot dear for information!
Handmade Gemstone Jewelry

Any particular preference of the metal it's made of and why?