IMO: You can get a .25 pendant from Bluenile for about the same price
I think the necklace is wicked cute, but .05 is a little too small, imo. You can get the bezel setting in white gold for pretty cheap from BN, or you can do the "create your own" one and get it in yellow gold (exactly like what you want) $300 setting, plus whatever $$ diamond.
http://www.bluenile.com/diamond-pendants-solitaire?oid=424
Here's white gold .25 for $450:
http://www.bluenile.com/diamond-pendant-solitaire_5074?nav1=jewelry_segment.jsp
Here's .33 for $650, compared to $2530 from Tiffany.
http://www.bluenile.com/diamond-pendant-white-gold_5075?nav1=jewelry_segment.jsp
I did the "create your own" with the yellow gold bezel setting, plus a $476 .46 diamond, for a grand total of $816, compared to nearly $2400 from tiffany.
If you want the Tiffany brand, then get it, but I think that you'll be really disappointed when you get the .05 diamond, when you could get something tons bigger for a better price, that looks exactly the same. Just my .02 though

http://www.bluenile.com/diamond-pendants-solitaire?oid=424
Here's white gold .25 for $450:
http://www.bluenile.com/diamond-pendant-solitaire_5074?nav1=jewelry_segment.jsp
Here's .33 for $650, compared to $2530 from Tiffany.
http://www.bluenile.com/diamond-pendant-white-gold_5075?nav1=jewelry_segment.jsp
I did the "create your own" with the yellow gold bezel setting, plus a $476 .46 diamond, for a grand total of $816, compared to nearly $2400 from tiffany.
If you want the Tiffany brand, then get it, but I think that you'll be really disappointed when you get the .05 diamond, when you could get something tons bigger for a better price, that looks exactly the same. Just my .02 though