The color of olivine varies from emerald green to olive green with a golden sheen. It is curious that, despite the rather long history (olivine was known as early as 4000 BC), it was confused with other stones for quite a long time. So, for example, Pliny called chrysolites all golden-yellow-green stones, including topazes.
Olivine, having a hardness of 6.5-7, is considered a fairly fragile stone, so products with it must be protected from shock and strong mechanical stress.