All the gold pendants and some of the silver pendants include a chain and you can find information about it in the description.
Some other Sterling silver pendants have a "nochain" tag and written "Chain not included" in the description. In this case you can decide to use your own chain or buy one of the two lenghts of chain:
Normal - 19in/48cm in Sterling Silver, same color as pendant, can be clipped also shorter (at 17 or 18in / 43 or 45cm) (€45.00)
Long - 22in/56cm in Sterling Silver, same color as pendant, can be clipped also shorter (at 19.5 or 21in / 50 or 53cm (€55.00).
If the jewel's length is not enough you can add an EXTENTION (€15,00). This accessory is made of Sterling silver and has the same color as the jewel that you choose. It's made of big enough links to clip the cosure at any lenght you prefer and can make your jewel up to 15cm / 5.9in longer by simply adding it to the closure of the chain or bracelet. You can decide to cut the remaining extention with a simple wire cutter, if you don't need it's entire length, or just leave it hang out of the jewel like a chain charm.
This accessory is not available for some jewels which have a special clip closure, but in that case you will not see it as an option in the description.