Although diamonds are known for their exceptional hardness, they are not indestructible and can still break or scratch under certain circumstances. Here's a breakdown:

1. Scratching: Diamonds rank 10 on the Mohs scale of mineral hardness, the hardest natural substance known. They can scratch most materials, including other diamonds. However, they can still be scratched by other diamonds or abrasive materials with similar or higher hardness. Store diamonds separately to prevent scratching.

2. Breaking: Although diamonds are extremely hard, they are susceptible to fracture or breakage, particularly with inclusions or fractures. Diamonds may chip, crack, or shatter when impacted at specific angles or under significant pressure. Diamonds with sharp corners or thin girdles are more prone to chipping or breaking. Handle diamond jewelry with care to prevent damage from impact or pressure, such as sports or heavy manual labor.

While diamonds are durable and resilient gemstones, they still require proper care and maintenance to ensure their longevity. Regular inspection, cleaning, and professional maintenance can help prevent damage and preserve the beauty and integrity of diamond jewelry.