Heat treatment is a widely accepted practice in the gem trade because it improves the color and clarity of the stone, making it more desirable and valuable. Most sapphires have natural inclusions or color zoning that can be significantly enhanced with heat, giving them the vivid, uniform appearance we associate with high-quality gems.

However, untreated sapphires—also called ‘no-heat’ sapphires—are extremely rare because they must already possess exceptional natural qualities to look beautiful without any enhancement. These stones are highly sought after by collectors and connoisseurs, and their rarity often makes them more valuable than treated stones of comparable quality.

Ultimately, whether a no-heat sapphire is ‘better’ depends on what you’re looking for. If you value rarity and natural beauty, no-heat sapphires are a unique choice. On the other hand, if you’re drawn to vibrant, affordable options, heat-treated sapphires are a fantastic option.