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Wednesday 5 April 2017

Diamonds are Forever: Birthstone for April

The Pink Star diamond which sold for £57m: The Independent
The Pink Star diamond which sold for $7m: image The Independent 
"She who from April dates her years,
Diamonds shall wear, lest bitter tears
For vain repentance flow."

This post was originally written in April 2017 but has been updated - April 2020 - with new diamond jewellery selections.

Lucky you, born in April - for your birthstone is the diamond!  Always in fashion and deliciously expensive. Let's find out more about this fabulous gemstone.
I've never had any diamonds - apart from the diamonds that surround the sapphire in my engagement ring. It's not that I don't like them: if money was no object I would love to have a huge cluster of diamonds and a sparkling diamond tennis bracelet. But I'm conscious that it's very easy to spot bad quality in diamonds, and to me, even if a small solitaire is top quality with no inclusions, it's still a very small stone compared to the colored gemstone I could get.

I've happily bought fake diamonds and some of those are very convincing.

So, how is diamond quality measured?

The Four C's for Diamonds: clarity, carat, colour and cut 

Diamond clarity is a quality of diamonds relating to the existence and visual appearance of internal characteristics of a diamond called inclusions, and surface defects called blemishes. Clarity is one of the four Cs of diamond grading, the others being carat, colour, and cut. The four Cs was established by GIA, the world’s foremost authority on diamonds, colored stones, and pearls, in the 1950s.

Diamonds in many colours

The GIA grades diamonds on a scale of D (colourless) through Z (light colour). All D-Z diamonds are considered white, even though they contain varying degrees of color. True fancy coloured diamonds (such as yellows, pinks, and blues) are graded on a separate colour scale.

Weighed in carats

Diamonds and other gemstones are weighed in metric carats: one carat is equal to 0.2 grams, about the same weight as a paperclip.

image showing GIA scale showing size by carat of diamonds
Different sizes of diamond. Copyright: GIA 

Strange but true....

The carat takes its name from the carob seed. Because these small seeds had a fairly uniform weight, early gem traders used them as counterweights in their balance scales.

The cost of diamonds

The price range for 1 carat diamonds is between $3,080 and $26,950 per carat. Round Brilliant Cut stones have a 6.5mm diameter.

Diamonds are most often bought as engagement rings, and the average cost in the UK is likely to be three months' salary, according to Brides.com. But these days the cost is often shared between the couple so it's not too unrealistic.

Buying diamonds with a clear conscience

Brilliant Earth has a very good guide to buying ethically sourced diamonds.

Let's Go Shopping

I'm not going to feature any engagement or eternity rings because if you're in the market for those you'll be doing a lot of research (maybe having your dream rings made to order).

No, what I've got in mind are some affordable diamonds we can buy for ourselves because we like them.


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  1. Yes! I'm an April girl and Diamonds are by far my favourite! My daughter loves the moissanite faux diamonds, and I have to say that they are very convincing x

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