0.5mm changes the difference in appearance and size.

This is an image of K18YG (18K yellow gold) earrings with different sizes.

We made earrings with 4mm stones and 4.5mm stones.
The 4.5mm stone was ordered, and the 4mm stone was still in stock, so I made it as an immediate delivery.

The difference is only 0.5mm, but when you put them side by side like this, it seems that there is a considerable difference in size.
If you take a picture of each pair alone, it's hard to tell how much difference there is.

In the world of moissanite jewelry, custom-made arrangements that are arranged as you like are now mainstream.