Something that is worth a lot of money is "valuable". A "valuable" (noun) is usually a small personal item that is of great worth. For example, a family heirloom (such as your great-grandmother's jade bangle) is a very "valuable" possession. A rare vintage item in mint condition becomes more "valuable" (adjective) with time. Something that you can't do without is "invaluable", as it is very useful to you. A piece of insider news can be "invaluable" (adjective) to an investor. A good friend can offer you a piece of "invaluable" advice when you are at the crossroads. Something "valuable" is worth a lot of money, while something "invaluable" is very useful and indispensable to you. Put in another way, something "valuable" has a monetary value; something "invaluable" is so important that you can't put a value on it. Example: Your "valuable" antique furniture can fetch a high price of two million dollars, but you will never part with it as it is so "invaluable" in your heart. Hope this helps.

"Valuable" means worth a lot of money. "Invaluable" means something that is priceless and irreplaceable. Here are two examples: 1) 100 kilos of pure gold is very valuable, but if it were stolen and an insurance company paid you for the value, you wouldn't be very upset because cash is just as good. 2) If the Mona Lisa were stolen from the Louvre, even if an insurance company paid the museum for the "value" of the painting a lot of people would still be unhappy because the painting is "invaluable" and no amount of money makes up for the loss.