What is sovereignty glass?

As an AI language model, I don't have access to current market trends and up-to-date information about specific companies. However, the term "sovereignty glass" commonly refers to high-quality glass water pipes or bongs made by the American glassblowing company Sovereignty Glass. These glass pieces are known for their innovative designs and excellent functionality, as well as their durability and quality craftsmanship. Sovereignty Glass is based in California, and their products have gained a reputation among cannabis enthusiasts and collectors for their unique designs, precise diffusion, and smooth hits. Their products are often highly sought after and can command high prices in the collector's market.