I am an Indian by origin and currently a Canadian citizen. During my recent holiday visit to India, I purchased a Turquoise gemstone along with a certificate from a reputable seller. Now, as I prepare to return to Canada (Surrey, British Columbia), I have a layover at London Heathrow Airport before my final destination with Air Canada.

I would like to know if there are any specific regulations regarding carrying gemstones while traveling. Do I need to provide any supporting documents, such as an invoice, a bill, or an authenticity certificate from a particular lab, for immigration clearance? Also, since I have a layover in London, I am curious if there are any specific requirements or restrictions at Heathrow Airport regarding carrying gemstones.

Has anyone had a similar experience? Any guidance on the required documents at both London Heathrow and Canada for a smooth immigration process would be greatly appreciated.

Looking forward to helpful responses. Thank you!

Ever since I moved to a place with an airport nearby, I've been wondering about those flight deal sites -- the ones like Scott's Cheap Flights, Mighty Travels, Thrifty Traveler, Faredrop, Secret Flying, Dollar Flight Club, etc (those are just the ones I found off a Reddit thread on r/TravelHacks).
Has anyone here had any experience with these paid services?

Also, does anyone know of a way I can search for a start and end point, and find other airports nearby to fly out of for much cheaper? I remember having used such a site earlier but cannot for the life of me remember its name now :-(