Brincos

It depends on the format. On a hoop it is the outside diameter of the circle, measured across the widest point.

On a stud it describes the front of the earring, meaning the stone or the decorative face, and not the post behind it.

On a drop or a dangle it is the overall length from the top of the fitting down to the lowest point of the design.

No, and that is the most common source of confusion. The same number describes a diameter on one format and a total length on another.

Where two figures appear they are usually width and height for a shaped front, or diameter and gauge for a hoop.

The reliable check is to hold a millimetre rule against the ear before ordering, which settles the question far better than comparing photographs.

The fitting, first, because it decides whether the design will work with the piercing it is intended for and is the hardest thing to change afterwards.

Then the dimensions, and specifically what the figures are measuring, since the convention changes between formats and the same number can describe two very different objects.

Then the metal colour and karat, which decide whether the piece will sit comfortably beside anything already worn in the same ear.

Studs sit flat against the lobe; hoops pass through it and return; huggies are hoops at short diameter that sit close to the ear.

Drops and dangles suspend a form below the fitting so that it moves, and climbers run upward along the edge of the ear instead of hanging.

Jackets sit behind the lobe with a separate stud passing through them, which turns a single piercing into a two-part design.

Metal colour, above everything else. It is the first thing the eye compares and the only element that looks wrong when it is slightly off rather than clearly different.

Scale is the second. A substantial pendant is unbalanced by very small earrings, and small earrings look accidental beside a large one.

Shape and stone do not need to repeat. A variation on a theme usually reads as more considered than an exact echo does.

They rarely need to. A ring and a pair of earrings are seen at different distances and almost never in the same glance, so exact repetition is wasted effort.

Metal colour is again the element worth aligning, since it is what registers across a room when nothing else about either piece is legible at that distance.

Where a set has been designed together the pieces will match by intention, and that is a different proposition from assembling a match from separate purchases.

Close-sitting designs. The upper ear is firm tissue with a tight curve, so anything that projects outward catches on hair, headwear and pillows.

Small hoops, huggies and flat studs are the formats that work with that geometry rather than against it, because they follow the curve instead of standing away from it.

Length is the other constraint. A design that hangs will swing against the edge of the ear rather than clear of it, which is uncomfortable over a long day.

Often, yes, and single listings exist precisely for this purpose. The constraint is usually available space rather than the fitting itself, which is the same in both holes.

A second piercing sits close above the first, so a design that projects outward or hangs will interfere with whatever is in the lobe below it.

Flat, close-sitting designs solve that, which is why so many second-hole earrings are small studs or short huggies rather than anything with length.

Fasten the back onto the post before putting a pair away. Separated components are how most single earrings begin their disappearance.

Use a divided box or a card with holes rather than a shared dish, so that each pair occupies its own compartment.

Take earrings out over a closed surface rather than over a basin, since a dropped back finds a drain with remarkable reliability.

Give each pair its own container. A compartmented case, a small zip pouch or even a buttoned card keeps the two halves together through handling.

Pack them in hand luggage rather than in a case that will be moved by other people, and put them away as soon as they come off rather than at the end of the evening.

If a piece has a fitting that works loose, deal with it before travelling rather than after, since a hotel carpet is an unforgiving place to notice.