A ring with a rotation and a lock function to display multiple anniversaries, the ring comprising: a main ring (MR) including engagement areas that engagement grooves are positioned on and distant areas positioned between the engagement areas; a sub ring (SR1, SR2) engaged with the main ring (MR) in a rotatable and fixable way, and engagement members (CP) positioned between the main ring (MR) and the sub ring, wherein the subring includes a receiver (AP) that receives an engagement member (CP); wherein the receiver (AP) includes a first side (S1), a second side (S2) facing the first side (S1) and connected to an opening area (OPA), a third and a fourth side respectively connecting between the first and the second side (S2); wherein the engagement member (CP) is made of materials having elasticity and positioned in the receiver (AP); wherein when the opening area (OPA) is aligned with the engagement groove area, a portion of the engagement member (CP) is protruded from the receiver (AP) outwardly and engaged with the engagement groove; wherein when the opening area (OPA) is aligned with the distant area, the portion of the engagement member (CP) is inserted in the receiver (AP), characterized in that a length of the opening area (OPA) in a first direction is shorter than a length of the first side (S1) in the first direction, and wherein the main ring (MR) includes: a first part (P1) extended in the first direction, a third part (P3) spaced apart from the first part (P1) in a second direction intersecting the first direction, a fifth part (P5) spaced part from the first part (P1) in an opposite direction to the second direction, a second part (P2) connecting between the first and the third part (P1, P3), and a fourth part (P4) connecting between the first and the fifth part (P1, P5). a main ring (MR) including engagement areas that engagement grooves are positioned on and distant areas positioned between the engagement areas; a sub ring (SR1, SR2) engaged with the main ring (MR) in a rotatable and fixable way, and engagement members (CP) positioned between the main ring (MR) and the sub ring, wherein the subring includes a receiver (AP) that receives an engagement member (CP); wherein the receiver (AP) includes a first side (S1), a second side (S2) facing the first side (S1) and connected to an opening area (OPA), a third and a fourth side respectively connecting between the first and the second side (S2); wherein the engagement member (CP) is made of materials having elasticity and positioned in the receiver (AP); wherein when the opening area (OPA) is aligned with the engagement groove area, a portion of the engagement member (CP) is protruded from the receiver (AP) outwardly and engaged with the engagement groove; wherein when the opening area (OPA) is aligned with the distant area, the portion of the engagement member (CP) is inserted in the receiver (AP), characterized in that a length of the opening area (OPA) in a first direction is shorter than a length of the first side (S1) in the first direction, and wherein the main ring (MR) includes: a first part (P1) extended in the first direction, a third part (P3) spaced apart from the first part (P1) in a second direction intersecting the first direction, a fifth part (P5) spaced part from the first part (P1) in an opposite direction to the second direction, a second part (P2) connecting between the first and the third part (P1, P3), and a fourth part (P4) connecting between the first and the fifth part (P1, P5). a first part (P1) extended in the first direction, a third part (P3) spaced apart from the first part (P1) in a second direction intersecting the first direction, a fifth part (P5) spaced part from the first part (P1) in an opposite direction to the second direction, a second part (P2) connecting between the first and the third part (P1, P3), and a fourth part (P4) connecting between the first and the fifth part (P1, P5). <EOS>