Promise Day is a special and unique day in the Valentine's Week, celebrated on the second day, specifically on February 11th. It is a day to make promises and express love and commitment to that special someone. If you're looking for the perfect Promise Day gift for your significant other, here are some original ideas to inspire you:

1. A Promise Ring: A promise ring is a traditional and symbolic gift to symbolize your love and commitment. It can be a simple band or have a small diamond or gemstone.

2. A Personalized Necklace: You can also make a promise to your loved one by giving a personalized necklace. You can have your loved one's name or initials engraved on it or choose a necklace that holds a special message.

3. A Love Letter: Write a heartfelt love letter to your loved one, expressing your feelings and promises for the future. This will be a treasured keepsake for years to come.

4. A Memory Jar: Create a memory jar filled with special moments and memories that you have shared together. This will be a unique and sentimental gift.

5. A Getaway Trip: Plan a surprise getaway trip for you and your loved one. This will be a promise of future adventures and memories together.

6. A Couple's Journal: Give the gift of a couple's journal. You and your loved one can write down your thoughts, feelings, and memories together.

7. A Promise Bracelet: You can also give a promise bracelet as a gift. It can have a special message engraved on it or have a symbol of your love and commitment.

In conclusion, there are many different ways to make a promise to your loved one on Promise Day. Whether it's a traditional ring or a more creative gift, the most important thing is the thought and sentiment behind it. Make sure your gift expresses your love, commitment and promises to your loved one.