Display a variation’s custom field only if it has value

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I created a custom field called Diameter and I want to display it only if it has value

I have the following in woocommerce / single-product / add-to-craft / variation.php:

<?php if ( !(empty(get_post_meta( $variation->get_id(), '_diameter', true )) ) ) : ?>
        <div class="product-diameter">
            {{{ data.variation.diameter }}}
        </div>
<?php endif; ?>

I tried $variation->get_id() but that didn’t seem to work

How do I get the get field value of a variation?