Which of these is a cutting center for colored stones in Thailand?

Chantaburi is recognized as a prominent cutting center for colored stones in Thailand due to its long-established history and infrastructure supporting the gemstone industry. This region has developed a reputation for quality gem cutting and is home to many skilled artisans and workshops specializing in various types of colored stones, particularly rubies, sapphires, and other gemstones.

The presence of numerous gem traders and markets in Chantaburi further enhances its status as a focal point for the trading and processing of colored stones. This hub attracts both domestic and international buyers, making it an essential center for the colored stone trade in Thailand.

While Bangkok, Chiang Mai, and Phuket also have their significance in the overall gem and jewel market in Thailand, none possess the same concentration of cutting and processing facilities specifically for colored stones as Chantaburi does. Thus, its unique role and contributions to the colored stone industry solidify Chantaburi as the correct choice for this question.