You can purchase Dior sunglasses in Hong Kong at the Dior boutique in Central. The boutique offers a wide range of Dior sunglasses, including the Stellaire Silver Blue model. The Dior team at the boutique is well-versed in the product and can provide detailed information about the features, materials, and benefits of each model. Additionally, there are many online reviews from customers who have purchased the Stellaire Silver Blue model and shared their positive experiences.