As a retired jewelleryvaluer with over 40 years jewellery trade experience, my advice has to be get it checked every 3 to 5 years. As stated previously, claws, settings & mounts can wear out or get thin & wear & tear is rarely coved by insurers so could be your liability if a partial loss occurs. If you get a decent valuer (appraiser in some countries) checking & updating is often done at reduced rates, check out Jewellery Appraisers of the World for independent respected & qualified valuers. My recommendation is; Do not go to buyers & sellers of jewellery, they may not necessarily understand all the ramifications of Jewellery Insurance law in your particular country, For lower value items, get a newspaper showing the date & photograph your items close up (& in focus) & store them safelly away, if you can show a ruler or a coin (for scale) then even better, dont keep them on your phone pop them on a memory stick somewhere safe. I have dealt with hundreds of claims & found insurers are usually fair but stricct, just think about 20 or 30 pairs of earrings, brooches & dress rings at about £50 to £100 each & not being able to prove ownership.