  We analyse the classical and quantum behaviour of a particle trapped in a
diamond shaped billiard. We defined this billiard as a half stadium connected
with a triangular billiard. A parameter $\xi$ which gradually change the shape
of the billiard from a regular equilateral triangle ($\xi=1$) to a diamond
($\xi=0$) was used to control the transition between the regular and chaotic
regimes. The classical behaviour is regular when the control parameter $\xi$ is
one; in contrast, the system is chaotic when $\xi \neq 1$ even for values of
$\xi$ close to one. The entropy grows fast as $\xi$ is decreased from 1 and the
Lyapunov exponent remains positive for $\xi<1$. The Finite Difference Method
was implemented in order to solve the quantum problem. The energy spectrum and
eigenstates were numerically computed for different values of the control
parameter. The nearest-neighbour spacing distribution is analysed as a function
of $\xi$, finding a Poisson and a Gaussian Orthogonal Ensemble(GOE)
distribution for regular and chaotic regimes respectively. Several scars and
bouncing ball states are shown with their corresponding classical periodic
orbits. Along the document the classical chaos identifiers are computed to show
that system is chaotic. On the other hand, the quantum counterpart is in
agreement with the Bohigas-Giannoni-Schmit conjecture and exhibits the standard
features for chaotic billiard such as the scarring of the wavefunction.
