Lapis - or to give it the correct name "Lapis Lazuli" - is a Blue Opaque Gemstone chiefly composed of Lazurite (a Sodium Calcium Aliminium Silicate with Sulpur).
Lapis has additional materials including Calcite and small sparkles of Pyrite and is 5 to 5.5 on the Mohs Hardness Scale.
Lapis makes excellent Jewellery, carvings, mosaics etc. and is also ground to make the pigment "ultramarine" which was widely used in renaissance oil paintings.
Some examples of Lapis are shown below.