Here's how to calculate that:

* 1 gram is approximately equal to 0.035 ounces.

* One and a half grams is 1.5 grams.

* Therefore, 1.5 grams x 0.035 ounces/gram = 0.0525 ounces.

So, one and a half grams is approximately equal to 0.0525 ounces, which is rounded to 0.53 ounces.