Red garnet is one of the most common and widespread of gems, found in metamorphic rocks (which are rocks altered by heat and pressure) on every continent. But not all garnets are as abundant as the ...

has been regarded as diagnostic for natural demantoid. The 2.51 ct stone was a rare cat’s-eye demantoid (figure 1). Demantoid garnet is by definition the green-colored andradite caused by chromium ...