The Almanac.com says
It symbolizes positivity, love, dedication, and an open heart, with each color carrying a distinct meaning: blue represents dignity and grace, pink signifies playful affection, white conveys happiness and joy, and purple is associated with first love

Click the link Almanac.com to read about Larkspur and Greek Mythology and its use in Victorian times. 

https://www.almanac.com/content/july-birth-flowers

According to Gemselect.com
Ruby is the modern and official birthstone for July, renowned for its deep red color, sometimes with pink or purple undertones, and its association with love, courage, and vitality. It belongs to the corundum family and is second only to diamond in hardness, making it highly durable and valuable for jewelry. Rubies are believed to ignite energy, inspire confidence, and protect against misfortune, and high-quality rubies, especially from Myanmar (Burmese), are rare and prized, though lab-created rubies offer more accessible options for jewelry