Some of the most expensive woods used for kitchen cabinets are:

Blackwood
Ebony
Mahogany
Rosewood

However, it is important to note that the cost of the wood is not the only factor that determines the overall price of kitchen cabinets. The cost of labor, hardware, and other materials also play a significant role in the final cost of the cabinets.

Blackwood is a dense and heavy wood that is native to Australia. It is known for its exceptional strength and durability, making it an ideal choice for kitchen cabinets that will be subjected to heavy use. Blackwood is also very resistant to moisture and decay, which makes it well-suited for use in humid environments such as kitchens. However, its dark color and close grain make it difficult to work with, which can increase the cost of production.

Ebony is another dense and heavy wood that is prized for its deep, rich color and fine, close grain. It is native to tropical regions of Africa and Asia, and is known for its exceptional durability and resistance to wear. However, it is also a very hard wood, which makes it difficult to work with and can increase the cost of production.

Mahogany is a tropical hardwood that is known for its rich, warm color and fine, straight grain. It is relatively soft and easy to work with, which makes it a popular choice for kitchen cabinets. However, it is also prone to denting and scratching, so it may not be the best choice for heavily used cabinets.

Rosewood is a dense and heavy tropical hardwood that is known for its beautiful color and grain. It is very durable and resistant to wear, making it a good choice for kitchen cabinets. However, it is also very expensive and can be difficult to find, which can increase the cost of production.

Overall, the most expensive wood for kitchen cabinets is likely to be a matter of personal preference and budget. It is important to consider the specific characteristics and qualities of each type of wood to determine which is the best choice for your needs.