Metal Green Chalcedony Edged Gourd Charm

Chalcedony is one of the forms quartz takes. Green chalcedony runs from leek green to apple green, translucent, with a milky brightness when light goes into it. On the market, the stones whose colour is too even and too vivid have mostly been treated, and that is something to tell a customer plainly rather than hedge. Natural stone always varies; two leaves on one plant are not the same green. Chalcedony and agate belong to one family, one without banding and one with, and the trade draws the line loosely. The waist of the gourd has to be drawn in cleanly. Drawn badly, it looks clumsy.

The body is chalcedony and the edge is metal. The frame is there to protect the rim: chalcedony is hard enough, but brittle, and a knock against a table corner will chip it. Metal round the whole edge puts the load on the metal first. It is also cosmetic, hiding the rough edge of the stone and leaving one clean face at the front. Not too many claws — four is enough; more of them block the stone and light stops going in. And do not make the frame wide, or the green has nowhere to show.

Fitting the setting is where the skill sits. There can be no gap between stone and metal, because dust gets in and turns black; nor can the stone be forced, because forcing cracks it. Turn the piece against the light and the seam should read as one line of even width. Leave a little clearance behind the stone so expansion has somewhere to go. Metal and stone differ so far in hardness that polishing has to protect the stone, or the edge gets scuffed. Green chalcedony carries white cottony inclusions, so check against the light and take the clearer stone.

Green with gold and green with silver are two different routes. A gold frame is warm and pulls the green towards yellow; a silver frame is cool and the green reads cleaner. On clothing, ink green, off-white and navy all hold it, while true red and bright orange fight with it. Fair skin takes silver, warm skin takes gold — not reliable, but a place to start. Green chalcedony looks well with brass; white copper is cooler and turns the green slightly blue. And leave no sharp angle between metal and stone, because a sharp corner chips into a notch.

The pendant is small and sits best at the collarbone. Choose a fine chain that will not steal the scene. Chalcedony dislikes heat, so keep it away from a radiator and out of an ultrasonic bath, which can shake up internal cracks that show nothing until a knock breaks them. Store it in its own bag rather than jammed against hard pieces in a box. Take it off in the shower, since shampoo sets in the seam of the setting and dries white. A plain chain is enough. Do not add a second pendant to the same chain.