When the element titanium was first discovered in the late 18th century in England, the technology for processing it was available. The name that was given to the metal was fitting for its strength and endurance – After the Titans, the sons of the Earth goddess in Greek mythology.
Titanium is mostly known for its durability. As it is three times the strength of steel, titanium jewellery can withstand almost any daily wear & tear conditions. That is in opposite to more traditional metals like gold and silver jewellery, which scratches easily in daily use.
Titanium is resistant to dilute sulphuric and hydrochloric acid, most organic acids, damp chlorine gas, and chloride solutions. So much that the Titanium metal is considered to be physiologically inert.
That means that it hypoallergenic, and will not cause allergic skin reaction as many other metals do. In fact, Titanium is the only known "foreign" material that living tissue will attach onto, which makes the ideal metal for implants in the human body.
On top of it, titanium is not mixed with other highly allergic substances that can irritate the skin, while gold, silver, and other metals are always mixed with other elements in jewellery making.