What happens if you put a topaz in a oven?

Heating a topaz in an oven can cause it to undergo thermal shock, which may lead to cracking or breaking, especially if the temperature change is rapid. Additionally, high temperatures can alter the gemstone's color, potentially diminishing its value. It's important to handle gemstones carefully and avoid exposing them to extreme heat or sudden temperature changes. Always consult a gemologist before attempting any heating methods.