Jewellery
Jewellery (British English) or jewelry (American English) consists of small decorative items worn for personal adornment, such as brooches, rings, necklaces, earrings, pendants, bracelets, and cufflinks. Jewellery may be attached to the body or the clothes. From a western perspective, the term is restricted to durable ornaments, excluding flowers for example. For many centuries metal, often combined with gemstones, has been the normal material for jewellery, but other materials such as shells and other plant materials may be used. It is one of the oldest type of archaeological artefact – with 100,000-year-old beads made from "Nassarius" shells thought to be the oldest known jewellery. The basic forms of jewellery vary between cultures but are often extremely long-lived; in European cultures the most common forms of jewellery listed above have persisted since ancient times, while other forms such as adornments for the nose or ankle, important in other cultures, are much less common.
Zirconian
The first 196 million years after the formation of Earth, left no solid trace, except for the formation of the Moon. This time is termed the Chaotian Era. The first datable solid Earth minerals, zircons, mark the start of the Zirconian Era. The oldest known crystal could be dated to 4,404 ± 8 Mya. It was in metasedimentary rock on Erawandoo Hills in the Jack Hills of Narryer Gneiss Terrane in Western Australia. The 4.4 Gya is the limiting age, and zircons this old are very rare. But from 4.2 to 4.1 Gya they are already common. The bulk of the zircons in Narryer Gneiss Terrane date much later, from 3.75 to 3.5 Gya.