Lab Pink Sapphire engagement rings? Absolutely! Diamonds may be a girl's best friend, but Lab Pink Sapphire engagement rings are a unique, original, and a far more affordable choice. Sapphire is the birthstone of September, and pink sapphire is a very popular gemstone in jewelry today. The bright and happy color of a pink sapphire ring is both playful and trendy. The birthstone of December, the intense deep blue color of a london blue topaz ring can evoke thoughts of warm Caribbean nights.