Shaastra say that bones are impure, but Shankh are super pure.

According to scriptures, there us a story behind Heeraa Shankh. There lived a poor woman named Heeraa Ujjwal in a village in North-East India. Gangaa River used to flow there. She was great devote  of Vishnu and Lakshmee. Once there spread an epidemic and many people dies in that village and in its vicinity. her two sons and their wives also affected with that epidemic. To save her family and other villagers, she was told in dream to keep fast and worship Vishnu and Lakshmee. Soon Vishnu appeared before her and assured that soon the epidemic will be over, but she should worship Dakshinaamoorti Shankh as lakshmee gets pleased with the worship of Dakshinaamoorti Shankh. Soon the villages were free from the epidemic and all became healthy. One great wave of sea came and took away all the Yagya material away with it. At this Heeraa Ujjwal became angry and she cursed Sea that he should go away from there and there should be plain there. The sea wave receded and now many species of Dakshinaavartee Shankh are found there, as they could not go with the sea wave.

Since the species was in danger, Varun Dev prayed Lakshmee Jee to do something to preserve them. Lakshmee Jee appearedd before Heeraa Ujwal and asked her to take her curse back. Heraa Ujjwal said to Lakshmee Jee - "My Shankh have turned back into stones, how can I continue my worship?" Lakshmee Jee aid - "From now onward Dakshinaavartee Shankh will give fortune whoever will worship them, but they will be fewer in quantity as many of them had turned into stones." She further said - "All the Shankh which have been turned into stones will be known as Heeraa Shankh from  today."

The worshipper of Heera Shankh will be blessed immense fortune and luck if the Jap of Lakshmee Mantra will be done using the Sphatik Maalaa. The Heera Shankh will be most beautiful Shankh that can happen by virtue of presence of different colored gems and precious stones and can take the devotee to the Lakshmee Siddhi. It is highly recommended to keep Heera Shankh in the Poojaa room or at Altar.

Mahaalakshmee Saadhanaa with Heera Shankh
Yellow cloth or mat, Rice, Incense, Vermillon, Wooden table, Some fruits, Oil lamp, Kamalgattaa Rosary or Crystal rosary, Heera Shankh, Altar.
Time :- Friday morning or Wednesday night Saadhanaa Procedure:- One should take bath, wear clean clothes.,Sst on a mat or cloth facing East. Cover a wooden seat with yellow cloth. Take a steel plate and draw a Swastik with Vermillon and place the Yantra and Heeraa Shankh on plate. Offer vermilion, Milk, Ghee, Sugar, Curd, Honey, Rice grains, flower petals on the Heera Shankh. Light the lamp and incense. Take water in the right palm and pledge - "I (speak your name) am doing this Saadhanaa for the removal of these problems in my life (specify the problems) and may Goddess Lakshmee bestow success upon me. Let the water flow to the floor. Offer prayers to Lord Ganpati by chanting "Om Mahaa Gam Ganpataye Namah " eleven times. Pray to your Guru or Shiv (thinking of him as your Guru) for Success in the Saadhanaa.  Then Chant the following Mantra 108 times-
"Om hreem shreem kleem Mahaalakshmee mam grehay aagachaya aagachaya hreem namah".

Then offer flowers and rice grains to the Goddess Lakshmee and pray to her to manifest and bless you. Perform the Aaratee of Lakshmi. Let the rosary and Heera Shankh remain in worship place. Next day Keep Heera Shankh in cash box/ locker/ Almirah or place it in altar. Whenever in the future you face financial problem chant one Maalaa of the Mantra.