Topaz

Topaz is aluminum fluorosilicate — a relatively common mineral that comes in nearly every color. The trade splits topaz into two markets: the treated blue stones that fill every mall jewelry case, and the naturally-colored imperial topaz that connoisseurs chase.

At Mohs 8 it’s harder than emerald and tourmaline, but topaz has perfect cleavage along one direction — a sharp impact at the wrong angle can split the stone. Set it protectively.

The two markets

Daily wear

Hardness is good (8) but the cleavage demands care. Avoid hard impacts. Bezel and partial-halo settings protect the stone’s edges; sharp prongs concentrate stress and risk a chip.

Ultrasonic and steam cleaners are not recommended on topaz — warm soapy water and a soft brush only.

Imperial topaz

The natural pink-orange variety mined almost exclusively in Ouro Preto, Brazil. Color comes from chromium. The most prized stones show a “sherry” or “peach” tone with a slight pink modifier. Stones over 5 carats with strong color are genuinely rare and priced accordingly.