Export a 3dm file texture

Good morning,
I hope everyone had a great Christmas and a Happy New Year.
I have been using Matrixgold for Rhino 7. And I am having issues exporting 3dm files with texture such as: Gold Jewellery with the colour of the gemstone.
I am looking into uploading .3dm, .fbx or 3mf files onto my website product page. It seems like .gltf files don’t support transparent objects such as glass with colours which means we cannot get the sparkle out of a stone.
So that’s why I am asking, can someone please help with the correct steps on how to export a .3dm file with the texture already implemented onto the object so when you go on a website such as: Online 3D Viewer You can view the item with all materials applied?
Kind Regards,
C.