Factors determining the grade and price of travertine are:

1- Stone mine

2- Stone color

3- Regularity of waves and halos of stone

4- The amount of porosity and density of the rock

5- Stone diameter

6 – Type of resin and stone putty

7- No stone kiln

8- Saw and stone cutting

9- Accurate sorting and minimum play of stone color

10- Availability of a large area of ​​a stone sort

11- Absence of impurities and soil veins

12- The edges of the stone are not full

13- The length and height of the stone

Travertine

Another limestone that is considered a building stone is called travertine, travertine which is called TRAVERTINE in French, left over from the sediments of seas, rivers, hot springs or water sediments. It is a mineral of caves. The specific weight of travertine is 2500 kg per cubic meter. This stone has pores and is softer in terms of hardness than marbles. Travertine is resistant to climate change, rain and snow and is also diverse in terms of color. Travertine stones in nature are white, cream, chocolate, red, walnut, yellow, lemon, silver and chocolate. Travertine can be used in the exterior of buildings and indoor spaces. Travertine stones are streaked in such a way that they can be cut and processed in wavy and non-wavy type. Over the years, the use of travertine for the exterior of buildings has been very common. Travertine stones are also used in the floor of some spaces in Europe and America, and this stone is suitable for people who are looking for building stones with a thickness of 1 cm or 1.5, because of its soft structure. Light travertine blocks that are mined have different colored heads and for this reason, they are classified into various colored categories due to their poor cutting. What is related or the price of travertine in the Iranian building stone market is the most important parameter is that the closer the color of the stone to light colors, the more expensive the price of the stone will be. He mentioned Darreh Bukhari travertine, Azarshahr travertine, Kashan Silver travertine, Agha Mohammadi chocolate travertine and Abyaneh travertine. The most exported travertine stones in Iran are Silver travertine, Azarshahr red travertine, lemon travertine, Darreh Bukhari travertine.