Yes, fish emulsions, commonly used as organic liquid fertilizers, do contain nitrogen. They are derived from the byproducts of fish processing, primarily comprising ground-up and partially decomposed fish parts. The emulsification process results in a nutrient-rich liquid that provides an excellent nitrogen source for plants. Fish emulsions typically contain other essential nutrients like phosphorus and potassium, but nitrogen is one of the primary components. They release nitrogen slowly into the soil, making them an efficient, natural way to nourish plants. Gardeners and farmers value fish emulsions for their ability to improve soil health and promote robust plant growth without the risk of chemical buildup or harm to the environment.

Homopolymer polypropylene (PP) is a type of plastic characterized by its long chains of propylene monomers. It is one of the two main types of polypropylene, the other being copolymer polypropylene. Homopolymer PP is known for its excellent chemical resistance, low moisture absorption, good fatigue resistance, and high tensile strength. These properties make it ideal for a wide range of applications, including packaging, textiles, automotive parts, and reusable containers. Despite its many benefits, homopolymer polypropylene has limitations, such as brittleness at low temperatures, which can be mitigated by adding impact modifiers or by using the copolymer variant. Its versatility, coupled with being lightweight and recyclable, makes it a popular choice in industries focusing on durable and sustainable materials.

Zircon is rated 6.5 to 7.5 on the Mohs scale of mineral hardness, making it relatively hard but not as hard as sapphires or diamonds, which are rated 9 and 10, respectively. For everyday jewelry like rings, zircon can be suitable but may require some care to prevent scratches or damage, especially compared to harder gemstones. It's a good choice for those who are looking for an affordable yet beautiful gemstone for occasional wear or for pieces that won't be exposed to rough activities. However, for an engagement ring or a piece that you plan to wear daily, you might want to consider a harder stone to ensure longevity and durability.

Generally. zircon can be used in rings because it has a Mohs hardness of 7.5. the highest of all hard stones like quartz and topaz. Nevertheless. it is not as tough as diamonds. rubies. or sapphires. It can easily break or scratch if not properly cared for. Therefore. it should only be worn occasionally. not every day. Protect it from strong impacts.