Quartz is suspicious. Topaz.
Diamond is suspicious

Quartz:System Hexagonal Quartz is very hard (7) and light.
No cleavage but good conchoidal fracture.
Transparent to translucent with vitreous luster.
Strongly piezoelectric and pyroelectric.

Topaz:System Orthorhombic Appearance Prismatic crystals,Physical properties Very hard (8) heavy ,fragile.perfect basal cleavage.Transparent or translucent with vitreous luster.

Diamond: System Isometric. Appearance usually octahedral,rounded crystals.Physical properties Dimorphic with graphite. The hardest mineral (10 on the Mohs scale) Heavy, fragile,with perfect cleavage.Transparent with adamantine luster and strong dispersion of light.Insoluble and infusible. Burns with difficulty,giving off carbon dioxide.Often fluorescent in ultraviolet light.