Solitaire diamond pendant: how to choose the right one
In Italy it is called punto luce, "point of light": a single diamond on a fine chain. It is the piece our customers most often choose as a first important gift, for an 18th birthday, a graduation or an anniversary. It looks simple, but a few details make the difference: carats, setting, gold colour and chain length. This guide goes through each of them.
What a solitaire pendant is
A solitaire pendant is a single stone, almost always a round brilliant diamond, set on a delicate chain. The Italian name punto luce describes the effect: when worn, the jewel almost disappears and only a point of light remains at the base of the neck.
It is a timeless, everyday jewel: it works with a T-shirt or an evening dress and layers easily with other necklaces. That is why it has become the classic gift for moments worth remembering.
In short: for a pendant that is noticed without being showy, most of our customers choose a diamond between 0.05 and 0.25 carats, in 18kt white gold, on a 40–45 cm chain.
How many carats: carat and millimetre chart
The carat (ct) measures a diamond's weight, not its size: 1 carat equals 0.2 grams. What the eye sees, however, is the diameter. The chart shows the average diameter of a well-proportioned round brilliant diamond.
| Carats | Approx. diameter | How it looks when worn |
|---|---|---|
| 0.03 ct | about 2.0 mm | Very delicate, ideal for teenagers and minimal styles |
| 0.05 ct | about 2.4 mm | Discreet but clearly visible up close |
| 0.10 ct | about 3.0 mm | The classic everyday pendant |
| 0.15 ct | about 3.4 mm | Bright, visible from a distance |
| 0.20 ct | about 3.8 mm | An important gift; a certificate is worth it from here |
| 0.25 ct | about 4.1 mm | Strong presence, very elegant |
| 0.30 ct | about 4.3 mm | A pendant for special occasions |
| 0.50 ct | about 5.2 mm | High-value jewel, choose it with a certificate |
Notice that going from 0.25 to 0.50 carats doubles the weight, but the diameter grows by just over a millimetre. The price grows much more, because larger diamonds are rarer. For many people the best balance is between 0.10 and 0.25 ct.
Setting: prongs, bezel and halo effect
The setting is the gold part that holds the diamond. It changes both the look and how secure the stone is.
Prong setting
Three, four or six thin claws hold the stone. Lots of light gets through, so the diamond sparkles at its best. The classic choice.
Bezel setting
A rim of gold surrounds the whole stone. More protected and modern, ideal for those who never take their jewellery off.
Illusion frame
A polished or faceted gold frame around the diamond reflects light and makes it look larger. A small diamond then reads as a much bigger stone.
In our Circle collection, for example, the faceted frame brings a diamond of a few hundredths of a carat to a visible diameter of 3–4 mm. It is a smart way to get a bigger look on a smaller budget.
White, yellow or rose gold
- 18kt white gold: the most popular. Its cool colour enhances the diamond's sparkle. Over time the rhodium plating can fade and can be redone in our workshop. To understand how this colour is made, read how white gold is made.
- 18kt yellow gold: warmer and more traditional, beautiful on olive or tanned skin.
- 18kt rose gold: romantic and modern, lovely with brown diamonds or pink stones.
A practical tip: choose the same colour as the jewellery the person already wears, so the pendant will match everything.
Chain length and style
A solitaire pendant looks best when it sits at the base of the neck or on the collarbone. The best lengths are 40 cm (choker length) and 45 cm (the most versatile). See all lengths in our necklace length guide.
Choose fine but strong chains, such as Venetian box or rolo: they are discreet and do not tangle easily. Some models have a second ring to shorten the chain by a few centimetres, useful when the pendant is a gift and you do not know the right size.
Diamond quality and certificate
Besides carats, colour, clarity and cut also matter: the famous 4Cs of diamonds. For a pendant, cut matters most, because it decides how much light the stone sends back.
Below 0.10 ct, differences in quality are hard to see with the naked eye. From about 0.20 ct upwards it is worth choosing a diamond with a gemmological certificate from a recognised laboratory such as GIA, stating weight, colour and clarity. The certificate protects the value of the jewel over time.
Wondering whether "brilliant" and "diamond" mean the same thing? Read diamond or brilliant.
Pendants with coloured gemstones
A solitaire pendant does not have to be a diamond. Ruby, blue sapphire, emerald, tanzanite, aquamarine or peridot add colour and can recall a birthstone. They are often framed by small diamonds that add sparkle.
Matching stud earrings
Diamond stud earrings are the natural companion of the pendant: one diamond per earlobe, with a butterfly or push-back clasp. If you give a set, choose earring stones slightly smaller than the pendant: the look is more balanced.
Frequently asked questions
How many carats should a solitaire pendant be?
For everyday wear the most common choice is between 0.05 and 0.15 carats. For an important gift, 0.20–0.30 carats, ideally with a gemmological certificate.
What is the difference between a solitaire pendant and a solitaire ring?
Both feature a single stone. The pendant hangs on a fine chain, while the solitaire ring is the classic engagement ring. The idea is the same: one stone, shown at its best.
Can I wear my diamond pendant every day, even in the shower?
18kt gold and diamonds are water resistant, but soap and creams dull the stone. Take it off for showers, swimming and sport, and clean it now and then with lukewarm water and mild soap.
White gold or yellow gold for a diamond pendant?
White gold enhances the diamond's sparkle and is the most frequent choice. Yellow gold is warmer and more classic. Match the colour of the jewellery the person already wears.
What chain length is best?
40 cm, which sits at the base of the neck, and 45 cm, which sits on the collarbone and is the most versatile.
When is a diamond certificate worth it?
From about 0.20 carats upwards. A certificate from a recognised laboratory such as GIA states weight, colour and clarity and protects the jewel's value.