Indian Gemmological Institute & Sai Life Sciences Ltd: Worth Investing After Fundamental Analysis?

I've analyzed the fundamentals of Indian Gemmological Institute and Sai Life Sciences Ltd, and they seem promising on paper. Key aspects like revenue growth, profit margins, and debt levels look solid. However, before I proceed, I’d like to hear from experienced investors: Are these stocks good picks for long-term holding? Do they have potential for growth considering market trends and industry performance? Any red flags I might have missed? Looking forward to insights from those with deep market knowledge. Thanks!