Is 3.49 TCW a lot of tanzanite for hoop earrings?

Yes. That is a large total weight for a silver hoop, which usually means many small stones pavé-set around the hoop rather than a few large ones. Expect a lot of sparkle and a heavier earring.

Can I wear these every day?

Tanzanite rates about 6 to 7 on the Mohs scale, so it is softer than diamond, sapphire or ruby. Daily wear is fine if you avoid knocks and store them separately, but they suit occasional wear better.

Will the sterling silver tarnish?

Yes, sterling silver tarnishes over time, faster with humidity and perfume. Wipe them after wear and store them in a dry pouch; a silver polishing cloth restores the shine.

Do the stones match in color?

Tanzanite ranges from violet to blue, and stones are usually color-matched within a piece. Expect some shift between blue and violet depending on the light.

What should I check before buying?

Confirm the carat weight, stone count and setting type, and whether the earrings come with a gemstone report. Compare the price against other Effy tanzanite hoops in silver.