Precious Gemstones

The four precious gemstones are diamond, ruby, emerald and sapphire. All MV precious stones are hand-chosen by Monica and bespoke cut to her specifications. Learn more about each stone in our guide.


Diamond is the hardest known mineral to man, formed by the elemental forces of heat and pressure up to 50 miles below the earth, more than three billion years ago. This universally adored precious stone is 140 times harder than sapphire and ruby, which explains why it is symbolic the world over for everlasting love.

Diamonds are made of pure crystallised carbon with trace amounts of other elements, notably nitrogen and boron. Increased amounts of these trace elements in the crystal create variation in colour. Stones with no trace elements are colourless. Increased amounts of nitrogen create a yellow 'Champagne' colour in the stone. Monica Vinader blue diamonds are treated by the annealing process in which heat is used to improve their colour and achieve a beautifully vivid tone.

The' brilliance' and 'fire' within a diamond is caused by its high refractive index - the highest of any naturally occurring gemstone - so the light will bounce and reflect within the stone, which along with its ability to be highly polished, creates the exquisite 'sparkle' effect.

Birthstone for: April

Ethical Sourcing

Monica Vinader is committed to ensuring ethical sourcing of our products and we work closely with our suppliers to ensure that they adhere to our Code of Conduct, which sets outs the standards of business behaviour we expect from our suppliers.

Our diamonds are sourced through suppliers who adhere to the Kimberley Process and the World Diamond Council's System of Warranties, preventing the distribution of conflict diamonds both in rough, cut and polished stones. Conflict diamonds are those smuggled by rebels to finance wars against legitimate governments. Our diamond suppliers are also compliant with United Nations resolutions.

The 4 C's

Cut refers to the diamond's reflective qualities resulting from the exact placements of facets within the stone. MV diamonds are cut to show their brilliance to optimum effect and the shape we use is round.

Diamonds are graded on their lack of colour. Most valuable diamonds are colourless, with the exception being diamonds with strong colour traces such as yellow, blue and pink, which are very rare. MV diamonds are H/I colour, which is near colourless on the scale.

Nearly all diamonds contain some natural inclusions. The visibility and number of these inclusions determine its clarity, and the fewer inclusions, the more valuable the diamond. The clarity grades are: Flawless, Internally Flawless, Very Very Slightly Included, Very Slightly Included, Slightly Included and Included. MV diamonds range from slightly Included- Included, meaning minute inclusions can be detected under 10 x magnification.

A Carat (ct) is a unit of measurement to weigh gemstones. A one carat diamond can come in varying sizes depending on how it is cut. You can find the carat weight of your MV diamond piece in its style description.

  • Blue Sapphire

    Blue sapphire's exquisite colour is the standard against which all other blue gemstones are measured. This precious gemstone is associated with royalty and has been used to adorn robes and royal jewels for centuries.

    The stone belongs to the corundum family of aluminium oxides, and titanium and iron impurities present together in the correct state result in its deep blue colour during formation. Our included blue sapphire comes from Thailand and is hand selected by Monica for its colour and character, making each piece individual and accessibly priced.

    Blue sapphire jewellery is like owning a piece of the night sky.

    Birthstone for: September

  • Emerald

    The name emerald comes from the ancient Greek for 'green' and the first known emerald mines date back to Egypt in 330BC. Cleopatra was known to have a passion for emerald, using it in many of her royal adornments.

    Emerald is a variety of the mineral beryl, and gets its green colour from traces of chromium and vanadium. Its colour ranges from yellow-green to blue-green and only gems that are medium to dark in tone are considered emerald. The stone often contains inclusions and fissures and, unlike diamond, it is graded by eye, so if there are no visible inclusions to the eye, the stone is considered flawless. Our included emerald is sourced from Brazil and hand selected by Monica from rough for its colour and character, making each piece unique and accessibly priced.

    Emerald is a dramatic stone that epitomises glamour.

    Gemstone for 20th and 35th wedding anniversaries

    Birthstone for: May

  • Ruby

    The name ruby comes from the Latin word ruber, meaning 'red'. Medieval Europeans wore rubies to guarantee health, wealth, wisdom, and success in love.

    This beautiful stone belongs to the corundum family of aluminium oxides, and is effectively a red sapphire, since both stones are identical in all properties except for colour. Ruby varies from a raspberry pink to a deep red, and ours come from Thailand, where Monica personally seeks out those that are pink in tone. Our included stones are chosen for their colour and character, making each piece individual and accessibly priced.

    Ruby is a striking stone like no other, and elevates any outfit.

    Birthstone for: July

  • Yellow Sapphire

    Yellow sapphire is an exquisite stone that belongs to the corundum family of aluminium oxides. The colour comes from a combination of iron and other trace elements during formation. Our yellow sapphire is sourced from Sri Lanka and heat treated to enhance its beautiful natural radiance.

    The yellow sapphires in MV jewellery are pavé set to create a glittering surface that shines with bright colour.