How Does the Mohs Scale Work for Engagement Rings?

When looking for engagement rings, chances are high that you will come across the Mohs hardness rating at some point. This can get confusing for those who are not sure what the scale is all about or how the hardness rating of a stone will affect the overall quality and longevity of the ring. To help you better understand how the Mohs scale works, we have put together a simple guide. This will help you be better informed when choosing engagement rings.

Before we get started, where does the Mohs scale idea originate? Named after Friedrich Mohs, a mineralogist who invented a way to measure hardness, the scale is based on how one mineral scratches another. Talc has the lowest rating (0), while diamonds have the highest rating (10). In between, there are many, many stones, each with their own hardness rating. Keep reading to find out more.

Mohs Hardness Rating for Engagement Rings

Simply put, the Mohs scale measures a stone’s hardness by determining whether it can be easily scratched or chipped. For example, diamonds have a hardness rating of 10. This means that they cannot be scratched by any other stone in a ring. This is why diamonds have long been the preferred choice for engagement rings.

Why is this scale important when choosing rings?

There is a very good reason to check the hardness rating of a stone. A stone that has a hardness rating of 7 or higher will be a good choice that will not be prone to damage. A stone with a lower hardness rating of 7 or under will be at risk of chips, scratches and other damages that will affect its quality over time. Choosing stones for their colour or beauty alone is never a good idea. Even if the stone looks good initially, it may not look as good in a few years if it has a low hardness rating.

How do you check the hardness rating?

All you need to do is a quick online search. Once you have an idea of a stone you love, look it up to check its rating. There are many excellent online resources that list various stones along with their hardness rating. You can also speak to your jeweller to get professional advice on the best and worst stones to use in your ring.

Which stones have the highest rating?

As we mentioned above, diamonds have the highest rating of all stones, with a hardness rating of 10. Other stones that have a high rating include sapphires and rubies (9), emeralds, aquamarine and topaz (8), and morganite and amethyst (7).

Which stones have the lowest rating?

Pearl is ranked 2, making it one of the softest minerals. Other low rating stones include azurite (3.5 – 4), malachite (3.5 – 4) and turquoise (5 – 6). Softer stones can be used as side stones in certain designs but should not be used as centre stones.

To learn more about choosing the right stone for your engagement ring, contact a professional jeweller such as Cape Diamonds for a custom-made ring that meets your specifications.

Fall in Love With These Topaz Engagement Rings

If you’re looking for something timeless and a little unusual, topaz engagement rings are sure to fit the bill. With a Mohs hardness rating of 8, topaz is a strong, durable stone. This stone ranges in colour, from a lighter shade of turquoise blue to a deep blue with a hint of green. Clear and radiant, topaz works well when paired with diamond. The stone can be added to rings in any metal. On a platinum or white gold band, the stone looks cool and vivid. On a warmer metal such as rose gold or yellow gold, the contrast adds plenty of visual interest.

To find out how to use topaz in your ring, here are some examples of gorgeous topaz engagement rings.

Timeless Topaz Engagement Rings

Whatever your dream ring may look like, topaz adds rich colour and plenty of sparkle. To see how beautiful this stone looks, here are some topaz engagement rings to keep you inspired.

Cushion Cut


Cushion cut rings remain a classic choice for many brides. The simple square shape of this cut works perfectly with a halo band of tiny pave stones. The surrounding diamonds help to highlight the centre topaz, drawing attention subtly as the pave stones continue into the band.

Pave Pear


Another classic cut, pear cut stones feature a rounded end on one side and a tapered point on the other side. The ring can be worn with the point facing up or down. This style can help to make fingers look longer. Tiny pave diamonds and a pale rose gold band add even more detail to this design.

East West


East West rings are all about symmetry. Rather than setting stones in a more conventional direction, these rings feature a stone that is positioned east to west rather than north to south. A warm yellow gold band and a detailed setting further add to this ring.

Three Stone


Three stone rings are rich in romantic symbolism, representing your past, present and future with the love of your life. Often, these rings feature a rounded centre stone. In this design, a square cut topaz is used, with tiny round diamonds flanking it on each side.

Pave Heart

Heart cut rings remain a romantic choice for obvious reasons. In this design, a yellow gold split band has pave stones on one side and plain metal on the other. Pave stones continue in an intricate design that wraps around the topaz heart, helping it stand out and shine.

Rose Gold


Topaz can also be found in darker shades. In this unusual design, a deep blue topaz is used in a very interesting vintage-style setting. A delicate rose gold band studded with pave stones further adds to its old-fashioned appeal. This style would be ideal for brides who prefer less conventional rings.

Minimal Marquise


For brides who are looking for something more understated, a minimal ring such as this would be ideal. In this design, a dark blue topaz in a marquise cut takes centre stage in a delicate, fine band that features two tiny diamonds. This style works in cool metals and warm metals. You could also use topaz for the side stones and add a diamond as the centre stone.

Split Band


In addition to having a split band, this ring also has an interesting open design. Two small pear cut topaz stones are positioned at each end of the pave band, adding balance and colour. The ring works well in cooler metals but warmer metals would certainly add plenty of drama.

When choosing stones to add to your ring, remember to check the Mohs hardness rating first. Stones should ideally be at least 7 or higher to ensure that your engagement ring lasts through the years.

Rosy Engagement Rings for the Romantic Bride

If you are looking for engagement rings that are full of romance and femininity, pink-coloured rings are a perfect choice. There are many different ways to add a touch of rosy romance to your ring. Some of the best pink stones include pink diamonds, pink sapphires, morganite, rose quartz, pink tourmaline, and rubies. You could try something soft, in a shade closer to blush or pale pink, or go for something more vivid, in a deeper pink or red.

Whether paired with a cooler toned metal such as platinum or white gold or with a warmer toned metal such as rose gold or yellow gold, rosy engagement rings add a touch of colour and romance. Keep reading to see some examples of how this style could work.

Get Swept Away by These Rosy Engagement Rings

Searching for something rosy and lovely? These engagement rings showcase just how charming pink-toned rings can be…

Split Band Morganite

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Morganite has become a popular stone in recent years. Its soft blush colour is neutral enough to work well in any setting, whether opting for a warm or cool coloured metal. It also works well next to diamonds, making it ideal for pave style rings. A split band in this ring is given more sparkle with tiny pave diamonds that accentuate the centre stone perfectly.

Pink Diamond Halo

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There are many other ways to add visual interest to a halo design. This classic round cut ring features a round diamond in the centre, followed by a ring of pink diamonds or pink sapphires in rose gold prong settings, followed by a traditional white diamond halo that flows to a pave band.

Two Heart Drop

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For something more unusual, this heart ring combines two hearts in a design that resembles a bow, signifying the love that you and your partner have and how it connects. A tiny ruby, pink sapphire or deep pink diamond is added as a drop between the hearts. A warm rose gold band completes this interesting ring.

Ruby Pink Sapphire

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Pink sapphires are as dazzling as their blue counterparts. In this ring, clear pink sapphires form a halo around a deep pink toned ruby. A delicate rose gold band helps to keep the focus on the centre stones. The balance of ruby and sapphire, in mid and deep pinks, add plenty of visual interest.

Pink Diamond Bloom

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Ramp up the romance with a vintage-inspired blossom ring in pink diamonds. Set on a delicate gold band, the soft shape of this floral ring design is accentuated by the pale coloured diamonds and the warm tone of the metal. You could use darker coloured diamonds or include a white diamond in the centre to add more detail.

Rosy Three Stone

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Three stone rings remain a popular choice, for good reason. Symbolising your past, present and future, these rings are full of romance. A simple pave band delicately twists, highlighting the three centre stones perfectly. Whether you opt for rubies, pink diamonds, sapphires or any other pink stone, this ring oozes romance.

Pink Sapphire Twist

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This pink sapphire twist has a more contemporary design. Tiny sapphires are encrusted on a twisting band in platinum or white gold, with white diamonds below and above. The pave twists lead to the centre diamond, adding detail and a hint of colour.

Rose Quartz Solitaire

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Not all pink stones have to be precious. Semi-precious stones can work equally well if you are looking for something understated and minimal. This rose quartz ring has a simple solitaire setting, a fine gold band, and tiny white diamonds encrusted in its band.

Adding some colour to your engagement ring is a great way to make it unique. Here at Cape Diamonds, we will help you plan the perfect ring, with custom engagement rings to suit every bride-to-be.