Carats are the universal unit of measurement for precious gemstones. Unlike the name may suggest, carat size actually refers to the weight of a gemstone, with 1ct equivalent to 200 milligrams. The larger the carat, the heavier the stone will be, which does not necessarily mean an increase in stone size. Two gemstones can be equivalent in weight but not size, therefore, carat weight is not a true indicator of stone size. For example, moissanite weighs roughly 15-18% less than diamonds, meaning that a brilliant round 6.5mm diamond weighs approximately 1ct compared to moissanite which weighs 0.88ct. Therefore, to make comparison easier for our customers we list our moissanite stones in approximate diamond equivalent weights according to their diameter.

To accurately understand the size of a gemstone it is important to look at its measurements in millimetres. All carat weights listed on our website are expressed in comparable millimetre (mm) size to scale, approximate average carat weights and approximate diamond equivalent weights. For more information click here to view our stone size comparison chart.

A strong appeal of moissanite engagement rings are that they enable couples to opt for a larger centre stone for a fraction of the price of a natural diamond, presenting the perfect opportunity for couples dreaming of a sizeable centre stone to be able to afford their dream ring. However, your budget may determine the stone size you choose, as there is a relationship between cost and size of moissanite gemstones.

For those wishing to portray their moissanite centre stone as a natural diamond you may also want to consider how realistic it would be for you to afford your chosen carat size in a diamond equivalent. Although a 2.2ct moissanite centre stone may be within your budget, a 2.2ct diamond can reach up to £50,000. Nevertheless, if you aspire to own an extravagant gemstone engagement ring, don't let this put you off. Here at Lily Arkwright we believe Moissanite is a stunning stone superior to mined diamonds in many ways, with more brilliance, fire and sparkle, as well as strong ethical origins, which everyone should be proud to show off!

If you’re planning a surprise engagement for your partner and are unsure of what stone size to choose, we recommend that you consider their personal style. Take into account what jewellery your loved one owns and wears, as well as their fashion tastes and opt for a stone to compliment this. If your fiancé-to-be is a minimalist a smaller stone size may be more desirable, whereas those with a love for glamour and extravagance are likely to dream of a larger centre stone.

To answer this you must consider the lifestyle of the wearer. A larger stone needs to be worn with care, as it poses a higher risk of being knocked and damaged due to its size. Therefore, if the owner has a physical job or lives a very active lifestyle it may be advised to choose a smaller centre stone (or ensure that you invest in insurance for your ring!)

You may also want to consider the heavy weight of larger stone sizes. If you or your partner aren’t used to wearing a lot of jewellery this heavier carat weight may be uncomfortable to wear. However, if you are dreaming of a large stone size, don’t let this put you off buying your dream ring; we’re sure you will easily be able to adjust to wearing a ring you truly adore!