It would be acid and caustic gas-proof, has higher melting point, but it'll be also more fragile (less pressure change it into BGLA). Useful for laboratories ;)
Well, it won't be as overpowered as DMND, as easily breakable as METL (even when heating by burning coal, it get melted and you have to fix it). Some people just want to work within some limits, so DMND is no go for them, and there are none (or very few) other elements that are actually acid-proof and can be heated to big temperatures without melting (lab glass can sustain temperature up to 1200 C, depending of glass' quality)
@darkhog(View Post) Well, does TPT really have "laboratories"? I know there are some saves which do fancy laboratory-style stuff, but if you need glass properties, use glass and if you need coloured DMND, use just that :)