I use a L1 Monument (100GemValue) a T9 Building (500GemValue) and (2) T8 Buildings (400GemValue) to Evolve my L1(T7) Monument to a L2(T10) Monument. That amounts to “Exactly” 1000GemValue for MY NEW Monument.
The Question is! If I use (2) T9Biuldings (1000GemValue) to Evolve that L1(T7) Monument (100GemValue) to the L2(T10), What happens to the 100Gems I “Mathmatically” wasted on that Monument Evolution?
Your math skills never cease to amaze me. If ppl like you didn’t bring up these issues, I’d never even notice the difference!
Our teams made sure the renewed honeymoon period makes up for any extra amounts of Gems/Building Bucks used to build/evolve a monument.
Wait. So are you saying the honeymoon period for buildings is longer or more rewarding if you overspend for monuments? (compared to the normal honeymoon period for spending the exact amount needed)
Cathylee, I completely agree! I wonder how many gems I am mathematically wasting every single day! 
Bravo to all of you Math Whizzes for sharing what works for you on our forum! Believe me when I tell you all how much it helps!
I have 4 Tier 15 monuments. When I hit the evolve button to see what I have it will only show 3. I have 3 of the same one and one of another. Is there a special reason for this? When I do evolve, Will I only be able to use 2 of any given kind even if I have multiples?
The Monument you are Evolving will not show because you are Evolving it. 
Thank you! That makes absolute perfect sense!
I’m going to Guess the HMP is “More Rewarding” than Longer! I think I will continue to Evolve “Exactly” rather than finding out that answer, LOL! 
I do like knowing those Gems are “Overly Invested” instead of “Mathmaticaly Wasted”. 
TYVM @Samantha 
Yesterday, I observed on my city map that I am able to revolve my level 2 monuments. Out of all the Level 2s, I had 2 (GOLD) monuments. I planned to use only ONE of the TWO gold monuments the next day. My HMP was way over 7 days.
The next day, which is today, as I look on the city map, ONE of the TWO LEVEL 2 (GOLD) MONUMENTS no longer exist. It just disappeared!I
This have happened before, I questioned it on a chat with CW several months ago. I’m so hair-brained I couldn’t comprehend what he was chatting about.
What I can’t get over is, I EARNED that gold Level 2 monument. Why take away?
Have anyone had that problem?
So sad Samantha
Please click “Submit a request” at the top of the screen, and our Customer Support team can see where the monument went.