I am looking for someone who interested to buy very rare gemstone. The size very amazing. Usually for museum collection. Imaging 125 carats of yellow sapphire. French museum had 136 carats only, not to far with this.
Get it certified by some good jeweler and then sell it to some gem dealer or if you don't want to certify it, just directly go to a jeweler or a gem dealer, he will tell you the value of it and may buy it if he is interested.
yellow sapphire 125 carats that is precious ,maybe not any people will choose only to buy a sapphire,but some diamond shopping can buy that to product their rings,maybe tiffany jewellery can use .find http://www.tiffanysjewellery.co.uk/