Fine grade citrine tumbled stones from our collection of crystals rocks and minerals. These medium and large sized stones which come Africa are natural citrine not heated amethyst. Due to this variety of quartz being relatively rare, much of the material used for commercial purposes is amethyst that has been heated. When amethyst is heated to in excess of 500°C which in mineral terms is not really that hot, its colour begins to change.
Distinguishing heated amethyst from natural citrine is usually quite easy because the colour of man-made citrine tends to be a rich shade of yellow or subtle to deep shade of orange. Furthermore it's common for heated amethyst to exhibit a significant amount of white quartz which you wouldn't see in natural citrine. Another obvious clue will be price because with citrine being a relatively a rare mineral it's not cheap.
Whilst most people expect citrine to be distinctively yellow, the shade of colour can vary quite significantly. The exact cause of the colour is still not known for certain although it's generally believed to be associated with the presence of aluminium and exposure to radiation. Iron may also be a contributing factor although many questions still need to be answered before that can be confirmed.
These African citrine tumbled stones are beautifully translucent and feel distinctively glass-like. Having a vitreous lustre means they reflect light in a similar way to glass but you only have to hold a stone up to the light to see it's absolutely a natural crystal.
Weights and sizes of our citrine crystals do vary from piece to piece but they're classed as a large sized tumbled stone. Due to the size difference we've split them into medium and large.