Google Ads for Gemstone Sales

I run a specialist online store that sells natural gemstones and jewellery-grade loose stones. I want a result-driven Google Ads campaign set up from scratch with one clear objective: turning browsers into paying customers... (Budget: $250 - $750 USD, Jobs: A/B Testing, Digital Marketing, Google Ads, Google Adwords, Internet Marketing, Keyword Research, Link Building, SEO)