Name : Devansh
Date of Birth : 08-04-1987
Time of Birth : 12:34 Hrs (IST)
Place of Birth : Mumbai (India)
Query : ….my lagna is Gemini …. which gemstones should I wear ?? and I want to be an actor ….

Devansh,
According to Vedic astrology, my observations are as follows:
1. Gemini ascendant and lord is placed in the house of fortune and father forming Rajyog, with the Mahadasha lord Venus. So, I will suggest you to wear around 6-7 Ratti of Emerald gem stone in your little finger.
2. Venus is lord of fifth and 12th house, you can try Opal gem stone, but before going for a ring, you must tie in white cloth in your arm. Only after getting good results you can wear ring.
3. Venus and Mercury are giving aspect to house of your hobby, so you can use this, but lord of profession house is Jupiter and Sun of your hobby, interest Sun are placed in the house of profession with Rahu.
4. I think, you will go with your interest, but Jupiter also suggests that you may go for some administration or some knowledgeable or some publications etc. even you can try apart from job for this acting or writing etc.
I have not checked your Dashmansha chart.