Celeb Jeweler Johnny Dang: 'I'll Replace Derek Fisher's NBA Rings ... And Make Them Look Better!!'

Great news for Derek Fisher ... one of the most famous celeb jewelers in the country wants to REPLACE his 5 stolen NBA championship rings -- and promises they'll be EVEN BETTER than the originals.

We spoke with Johnny Dang -- who's made a TON of super expensive bling for stars like Von Miller, Johnny Manziel, Sean Kingston, Kylie Jenner and more -- and he wants to hook Fish up.

TMZ Sports broke the story ... the ex-Lakers star's L.A. home was burglarized this week and we're told the bad guys made off with $300k in jewelry ... including the rings.

Enter Dang ... who says he'll HOOK FISH UP ... even cut him a sweet deal.