Is a .12-carat diamond big enough for a pendant?

It is a small, subtle stone, roughly the size of a grain of rice. It suits a delicate everyday look; shoppers wanting a visible centerpiece should look at .25 carat or more.

What is the chain length and can it be adjusted?

The chain is 16 inches with a spring ring clasp, so it sits at the base of the neck. It has no extender; a jeweler can add one or a longer chain.

Is the metal gold or platinum?

Despite the name, the listed specs say platinum, PT950, with a white metal color. Confirm the metal with the seller before buying.

What diamond grade do I get?

The listing gives ranges, D-J color and IF-SI1 clarity, not one grade. Each stone is Tiffany-certified, so the exact grade is on its certificate.

Yes for a milestone or first fine-jewelry gift. It comes in Tiffany packaging and suits anniversaries, birthdays and Christmas.

How does it compare with other solitaire pendants?

It offers a Tiffany-certified stone in solid platinum, which most similar-carat pendants from other jewelers do not. The trade-off is the small stone and the brand premium.