What are the cost advantages of using melee lab-grown diamonds compared to natural melee diamonds? Are melee lab-grown diamonds as durable and long-lasting as natural melee diamonds? Can you provide insights into the availability and variety of melee lab-grown diamonds in terms of different shapes, sizes, and colors? Are there any specific guidelines or recommendations for caring and maintaining melee lab-grown diamond jewelry? How do consumers verify the authenticity and origin of melee lab-grown diamonds when making a purchase? Are there any industry-recognized certifications or standards for melee lab-grown diamonds?