Crystal Heart Glass is a high-end glassware brand that offers a variety of unique and beautiful glass pieces. Their SEMENSTRESS Transparent Tortoise glasses are made from an extremely durable boro-silicate glass that is resistant to chipping and cracking. Customers have praised the glasses for their eye-catching design and their ability to keep drinks cold for longer periods of time. The glasses are also easy to clean and are dishwasher safe. Customers have also noted that the glasses have a pleasant weight to them and are comfortable to hold.