SiC pearls are made from silicon carbide, offering high thermal conductivity and durability, while ruby pearls are made from synthetic ruby, providing excellent thermal properties and resistance to thermal shock. SiC pearls have superior thermal conductivity and durability, making them ideal for long-term use, while ruby pearls, although also durable, may be more susceptible to damage if mishandled. Both types are resistant to thermal shock, ensuring they can withstand rapid temperature changes without cracking or shattering.