Teak wood has several grades: A, B, C, also A1, A2 etc. Quality of the material depends on the region where the tree grows and particular plantation. As complicated as wine...
But to be confident in the quality of the teak products you just need to take the old teak. This is the wood which was held drying naturally for at least 10 years. During this time the wood could be used as a material for other objects.
The Old teak we use to produce our furniture in the past was the material for the houses on the island of Java (known as Joglo - traditional vernacular house of Javanese people). Then these houses were reassembled and the wood, which has become a valuable, moved to Bali where we created our objects.