To add on
@Darkonflare15's post below, this would be a great addition to apply with Jewelry Crafting. Also, I didn't research this in the forums so my apologies if this has already been suggested. If it has, feel free to link those posts with this one.
I am an avid treasure hunter. I love exploring and finding treasure chests behind every nook and cranny. In the past Elder scrolls games, you have all kinds of different gems, gold,silver, and other items and that you could sell and make money off it. Right now most of those items are just trait stones which has no value what so ever to in-game merchants. I would not mind having flawless versions of those stones found among the treasure so that it feels like I am actually getting treasure in a treasure chest. As of now all we get from treasure is some random leveled weapon or armor, malachite, some times some armor sets, and a hundred gold coins which is not much treasure. You can also add items similar to what you find in safe-boxes which are actually label as treasure and makes some specific to treasure chests. I would not mind finding Dwemer, Daedric, or Ayelid artifacts in chests or find them lying around in the ruins and sale to the Mages guild for a tiny profit. It would be nice to be rewarded with actual profitable items. It would also be nice for the treasure chest to scale properly. It is already rare to find master chests or safeboxes in the game and when I find them I get less stuff than I find in advance chests and safeboxes which is disappointing. I would be a happy camper if treasure chests would be a little more rewarding.
The material(ore) to make Jewelry would be the same that's already in the game. Since this is a metal working skill, this should be included within the Blacksmtihing profession. To make a crafted set jewelry piece, one must have the armor traits researched for the desired set. You would then need a Flawless Gem to apply the desired attribute. Flawless Rubies for Health, Flawless Sapphires for Magicka and Flawless Emeralds for Stamina attributes. Enchants would need to be used with jewelry to make the desired piece like what we have now. To make a Health jewelry piece with all health on it would require a plus armor health enchant. A Robust ring with magicka would require an armor magicka enchant and so forth. Any crafted jewelry piece could have any of the existing jewelry enchants used to create your ideal combination of bonuses.
Flawless Diamonds could be used as a bonus stone like the Heijeko run and apply all three attributes to the jewelry piece(limited to necklace only). Or it could just be a valuable vendor item.
Hopefully this wouldn't require too much programming and could be added into any future DLC pack AFTER the Thieves Guild.
NA Server - Kildair