Yes, INTAGLIOS is a Scrabble word!

Letter values in Scrabble US: I 1, N 1, T 1, A 1, G 2, L 1, I 1, O 1, S 1.

Is it a valid word?

INTAGLIOS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a printing process that uses an etched or engraved plate; the plate is smeared with ink and wiped clean, then the ink left in the recesses makes the print
glyptic art consisting of a sunken or depressed engraving or carving on a stone or gem (as opposed to cameo)

Also: intaglio printing.

Not playable in Scrabble US: DIAGLYPH.