Rubies are beloved in the jewellery world not only for their colour, but for their durability. This makes them a top choice for rubies for jewellery making, especially in rings, earrings, and bold pendants. The majority of rubies you see today—whether loose rubies or set in pieces—will have undergone heat treatment to enhance their clarity and tone. This is a standard, accepted practice and doesn’t detract from their beauty or value.
That said, truly natural, untreated rubies with excellent colour and clarity are incredibly rare—and command significant prices.
You might also encounter star rubies—cabochon-cut stones with a rare asterism that shimmers across the surface. These are highly collectible and visually mesmerising.