Birthstone Calculator

Choose a birth month to look up modern birthstone choices. Some months have one common stone, while others have several alternatives. The result is a jewellery tradition, not a medical treatment or evidence that a gemstone affects luck, health or personality.

How the calculation works

The lookup uses the month-based birthstone choices listed by the Gemological Institute of America. It does not need the year or day of birth. Alternative stones can reflect different traditions and modern additions to jewellery lists.

Worked example

A September selection returns sapphire. June offers pearl, alexandrite or moonstone; December offers turquoise, tanzanite or zircon. More than one valid option means you can choose according to appearance, budget and intended use.

Choosing a birthstone gift

Start with the recipient’s preferred colour and jewellery style. Ask a jeweller about the exact gemstone, any treatments, suitable care and whether the setting suits everyday wear. The calculator simply narrows the month-based choices.

Month-based traditions and zodiac traditions

This lookup is based on calendar months, whereas zodiac dates divide the year differently. Do not assume that a zodiac stone and a modern monthly birthstone must be the same. Keep the tradition you are using explicit when comparing lists.

Important limitations

Different cultural and historical lists can vary. Gemstone identity, treatments and durability are separate questions from its association with a month. A month match is not a certification of a particular piece of jewellery.

Frequently asked questions

Can one month have several birthstones?

Yes. The lookup includes commonly listed alternatives.

Do I need to enter my full birth date?

No. The month is enough for this month-based lookup.

Reference

GIA birthstones by month. The method and limitations above identify what this page does and does not infer from that reference.