Quality evaluation should focus on the bloom stage, stem strength, and hydration levels. For B2B buyers, the ideal bloom stage is 70-80% open to ensure longevity during transit while maintaining visual appeal. Stems must be sturdy and upright, free from browning or 'shattering' (petals falling off). Ensure the flowers have undergone anti-ethylene treatment (STS or 1-MCP), which is critical for preventing premature wilting in Gypsophila. Additionally, check for uniformity in bunch weight and stem length, typically ranging from 60cm to 80cm for premium grades.