January Birthstone: Garnet Jewelry

Garnet. It has been the January stone in the modern list since it was standardised in 1912, and unlike some months January has only ever had the one stone.

Garnet is not a single mineral but a family of related silicates, which is why it appears in so many colours - deep red, raspberry, orange and green all belong to it.

The classic association is with the deep red variety, and that is still what most January birthstone jewellery uses.

No, and this is the most common misconception about the stone. Garnet is a mineral group, and different chemistries within that group produce different colours.

Red garnets such as Mozambique are the most familiar. Rhodolite is purplish-red to raspberry. Spessartite runs orange to mandarin. Tsavorite is a vivid green.

All of them are genuinely garnet and all of them are correct for a January birthday, so a recipient who does not care for red is not stuck with it.

Rhodolite is a specific garnet variety with a purplish-red to raspberry colour, lighter and more luminous than the deep red of Mozambique or almandine garnet.

The difference comes from chemistry: rhodolite sits between the pyrope and almandine compositions, and that intermediate makeup produces the distinctive tone.

In practice rhodolite tends to look brighter and less heavy on the hand or at the neck, which is why people who find classic red garnet too dark often prefer it.

Garnet sits at roughly 6.5 to 7.5 on the Mohs scale depending on the variety, which makes it durable enough for regular wear but softer than sapphire or ruby.

For a ring worn every day, a setting that protects the stone's edges is the sensible choice - a bezel, or a lower profile that keeps the stone out of harm's way.

As a pendant, a necklace or earrings, garnet is entirely practical without any special consideration, since those pieces take far less impact than a ring does.

Garnet is one of the few coloured stones that is very commonly untreated. Most pieces are simply cut and polished, with nothing done to alter the colour or the clarity.

That is genuinely unusual - the majority of coloured gemstones on the market have been heated, filled or otherwise enhanced - and it is one of the reasons garnet is well regarded among people who care about that.

Treatment is always a stone-by-stone matter rather than a rule about a species, so check the individual listing if it will affect your decision.

Tsavorite is a green variety of grossular garnet, and its colour is vivid enough that it is regularly mistaken for far more expensive green stones.

It was identified relatively recently, in the late 1960s, in East Africa, and it takes its name from the region where it was found.

For a January birthday it is a genuine option for anyone who does not want red, and it sits at the harder end of the garnet range.

Yellow gold is the traditional pairing for red garnet and emphasises its warmth, which is why so much antique garnet jewellery is yellow.

White metals - white gold or platinum - give a red or raspberry garnet a cleaner, cooler background and make the colour read as more contemporary. Rose gold sits very naturally beside rhodolite in particular.

For tsavorite and other green garnets, white metals let the green stay pure while yellow gold warms it noticeably.

No. Garnet is stable in light and does not fade with normal wear or display, which is not true of every coloured stone.

It is also stable at ordinary temperatures, so it does not need the kind of protection some other stones want.

The precautions that do apply are mechanical and chemical: keep it away from harder stones in storage, and away from household cleaning products.

Sizes are given in millimetres rather than carat weight, because millimetres describe what the wearer will actually see. Carat is a measure of weight, and stones of different density look different at the same weight.

For everyday earrings and a discreet pendant, smaller stones sit comfortably and get worn far more often. For a ring meant to be noticed, scale is the point.

The stated dimensions on each listing are the reliable guide, and holding a ruler against them gives a better sense of scale than a photograph does.

It is the traditional answer, and January has the practical advantage of falling right after the holidays, when a personal gift lands well.

Pendants, necklaces and earrings need no size at all, which removes the main risk in buying jewellery for someone else. An eighteen-inch necklace suits most adults.

The colour range helps too. If deep red is not to their taste, rhodolite, spessartite or tsavorite are all genuinely garnet and all correct for the month.