Is this mug dishwasher safe?

Yes. The listing states it is dishwasher safe, so it can go in the machine with normal dishes. Hand washing is still gentler on the printed design over time.

What size is the mug?

It is a standard ceramic coffee mug, the usual 11-ounce range that most people use for coffee or tea. It is not a large soup-style mug.

Is it microwave safe?

The listing does not state microwave safety. Ceramic generally handles short reheats, but check the seller's details before microwaving, since some printed finishes are not rated for it.

Is this a good gift for a Gemini?

It works as a small, low-risk gift for a Gemini birthday in late May or June. The zodiac theme is the appeal; do not expect premium ceramic or insulation.

How does it compare with other zodiac mugs?

It is a basic black ceramic mug with a June Gemini design. Other astrology mugs offer similar quality, so choose on the design and the seller's print reputation rather than features.